row0mysql.c 92.4 KB
Newer Older
1 2 3 4 5 6 7 8
/******************************************************
Interface between Innobase row operations and MySQL.
Contains also create table and other data dictionary operations.

(c) 2000 Innobase Oy

Created 9/17/2000 Heikki Tuuri
*******************************************************/
unknown's avatar
unknown committed
9

10 11 12 13 14 15 16 17 18 19 20 21 22 23
#include "row0mysql.h"

#ifdef UNIV_NONINL
#include "row0mysql.ic"
#endif

#include "row0ins.h"
#include "row0sel.h"
#include "row0upd.h"
#include "row0row.h"
#include "que0que.h"
#include "pars0pars.h"
#include "dict0dict.h"
#include "dict0crea.h"
24
#include "dict0load.h"
unknown's avatar
unknown committed
25
#include "dict0boot.h"
26 27 28
#include "trx0roll.h"
#include "trx0purge.h"
#include "lock0lock.h"
29
#include "rem0cmp.h"
unknown's avatar
unknown committed
30
#include "log0log.h"
unknown's avatar
unknown committed
31
#include "btr0sea.h"
unknown's avatar
unknown committed
32 33
#include "fil0fil.h"
#include "ibuf0ibuf.h"
unknown's avatar
unknown committed
34

unknown's avatar
unknown committed
35 36 37
/* A dummy variable used to fool the compiler */
ibool	row_mysql_identically_false	= FALSE;

unknown's avatar
unknown committed
38 39 40 41 42 43 44 45 46 47 48
/* List of tables we should drop in background. ALTER TABLE in MySQL requires
that the table handler can drop the table in background when there are no
queries to it any more. Protected by the kernel mutex. */
typedef struct row_mysql_drop_struct	row_mysql_drop_t;
struct row_mysql_drop_struct{
	char*				table_name;
	UT_LIST_NODE_T(row_mysql_drop_t) row_mysql_drop_list;
};

UT_LIST_BASE_NODE_T(row_mysql_drop_t)	row_mysql_drop_list;
ibool	row_mysql_drop_list_inited 	= FALSE;
49

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
/* Magic table names for invoking various monitor threads */
static const char S_innodb_monitor[] = "innodb_monitor";
static const char S_innodb_lock_monitor[] = "innodb_lock_monitor";
static const char S_innodb_tablespace_monitor[] = "innodb_tablespace_monitor";
static const char S_innodb_table_monitor[] = "innodb_table_monitor";
static const char S_innodb_mem_validate[] = "innodb_mem_validate";

/* Name suffix for recovered orphaned temporary tables */
static const char S_recover_innodb_tmp_table[] = "_recover_innodb_tmp_table";
/***********************************************************************
Determine if the given name ends in the suffix reserved for recovered
orphaned temporary tables. */
static
ibool
row_mysql_is_recovered_tmp_table(
/*=============================*/
				 /* out: TRUE if table name ends in
				 the reserved suffix */
	const char*	name)
{
	ulint	namelen	= strlen(name) + 1;
	return(namelen >= sizeof S_recover_innodb_tmp_table
		&& !memcmp(name + namelen -
			sizeof S_recover_innodb_tmp_table,
			S_recover_innodb_tmp_table,
			sizeof S_recover_innodb_tmp_table));
}

/***********************************************************************
Determine if the given name is a name reserved for MySQL system tables. */
static
ibool
row_mysql_is_system_table(
/*======================*/
				 /* out: TRUE if name is a MySQL
				 system table name */
	const char*	name)
{
	if (memcmp(name, "mysql/", 6)) {
		return(FALSE);
	}
	return(0 == strcmp(name + 6, "host")
	    || 0 == strcmp(name + 6, "user")
	    || 0 == strcmp(name + 6, "db"));
}
95 96 97 98 99 100 101 102 103 104 105 106 107

/***********************************************************************
Delays an INSERT, DELETE or UPDATE operation if the purge is lagging. */
static
void
row_mysql_delay_if_needed(void)
/*===========================*/
{
	if (srv_dml_needed_delay) {
		os_thread_sleep(srv_dml_needed_delay);
	}
}

108 109 110 111 112 113 114 115 116 117 118 119 120 121
/***********************************************************************
Reads a MySQL format variable-length field (like VARCHAR) length and
returns pointer to the field data. */

byte*
row_mysql_read_var_ref_noninline(
/*=============================*/
			/* out: field + 2 */
	ulint*	len,	/* out: variable-length field length */
	byte*	field)	/* in: field */
{
	return(row_mysql_read_var_ref(len, field));
}

122 123 124 125 126 127 128 129 130 131 132 133 134
/***********************************************************************
Frees the blob heap in prebuilt when no longer needed. */

void
row_mysql_prebuilt_free_blob_heap(
/*==============================*/
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct of a
					ha_innobase:: table handle */
{
	mem_heap_free(prebuilt->blob_heap);
	prebuilt->blob_heap = NULL;
}

135 136 137 138 139 140 141 142 143
/***********************************************************************
Stores a reference to a BLOB in the MySQL format. */

void
row_mysql_store_blob_ref(
/*=====================*/
	byte*	dest,		/* in: where to store */
	ulint	col_len,	/* in: dest buffer size: determines into
				how many bytes the BLOB length is stored,
unknown's avatar
unknown committed
144 145 146 147 148 149 150 151
				the space for the length may vary from 1
				to 4 bytes */
	byte*	data,		/* in: BLOB data; if the value to store
				is SQL NULL this should be NULL pointer */
	ulint	len)		/* in: BLOB length; if the value to store
				is SQL NULL this should be 0; remember
				also to set the NULL bit in the MySQL record
				header! */
152
{
unknown's avatar
unknown committed
153 154 155 156 157
	/* MySQL might assume the field is set to zero except the length and
	the pointer fields */

	memset(dest, '\0', col_len);

158 159 160 161 162
	/* In dest there are 1 - 4 bytes reserved for the BLOB length,
	and after that 8 bytes reserved for the pointer to the data.
	In 32-bit architectures we only use the first 4 bytes of the pointer
	slot. */

unknown's avatar
unknown committed
163 164 165 166
	ut_a(col_len - 8 > 1 || len < 256);
	ut_a(col_len - 8 > 2 || len < 256 * 256);
	ut_a(col_len - 8 > 3 || len < 256 * 256 * 256);

167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
	mach_write_to_n_little_endian(dest, col_len - 8, len);

	ut_memcpy(dest + col_len - 8, (byte*)&data, sizeof(byte*));	
}

/***********************************************************************
Reads a reference to a BLOB in the MySQL format. */

byte*
row_mysql_read_blob_ref(
/*====================*/
				/* out: pointer to BLOB data */
	ulint*	len,		/* out: BLOB length */
	byte*	ref,		/* in: BLOB reference in the MySQL format */
	ulint	col_len)	/* in: BLOB reference length (not BLOB
				length) */
{
	byte*	data;

	*len = mach_read_from_n_little_endian(ref, col_len - 8);

	ut_memcpy((byte*)&data, ref + col_len - 8, sizeof(byte*));

	return(data);
}

/******************************************************************
Convert a row in the MySQL format to a row in the Innobase format. */
static
void
row_mysql_convert_row_to_innobase(
/*==============================*/
	dtuple_t*	row,		/* in/out: Innobase row where the
					field type information is already
					copied there, or will be copied
					later */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct where template
					must be of type ROW_MYSQL_WHOLE_ROW */
	byte*		mysql_rec)	/* in: row in the MySQL format;
					NOTE: do not discard as long as
					row is used, as row may contain
					pointers to this record! */
{
	mysql_row_templ_t*	templ;	
	dfield_t*		dfield;
	ulint			i;
	
	ut_ad(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
	ut_ad(prebuilt->mysql_template);

	for (i = 0; i < prebuilt->n_template; i++) {

		templ = prebuilt->mysql_template + i;
		dfield = dtuple_get_nth_field(row, i);

		if (templ->mysql_null_bit_mask != 0) {
			/* Column may be SQL NULL */

			if (mysql_rec[templ->mysql_null_byte_offset] &
 					(byte) (templ->mysql_null_bit_mask)) {

				/* It is SQL NULL */

				dfield_set_data(dfield, NULL, UNIV_SQL_NULL);

				goto next_column;
			}
		}			
		
		row_mysql_store_col_in_innobase_format(dfield,
					prebuilt->ins_upd_rec_buff
						+ templ->mysql_col_offset,
					mysql_rec + templ->mysql_col_offset,
					templ->mysql_col_len,
					templ->type, templ->is_unsigned);
next_column:
		;
	} 
}

/********************************************************************
Handles user errors and lock waits detected by the database engine. */

ibool
row_mysql_handle_errors(
/*====================*/
				/* out: TRUE if it was a lock wait and
				we should continue running the query thread */
	ulint*		new_err,/* out: possible new error encountered in
unknown's avatar
unknown committed
256 257 258
				lock wait, or if no new error, the value
				of trx->error_state at the entry of this
				function */
259 260
	trx_t*		trx,	/* in: transaction */
	que_thr_t*	thr,	/* in: query thread */
261
	trx_savept_t*	savept)	/* in: savepoint or NULL */
262 263 264 265 266 267 268 269 270 271 272
{
	ulint	err;

handle_new_error:
	err = trx->error_state;
	
	ut_a(err != DB_SUCCESS);
	
	trx->error_state = DB_SUCCESS;

	if (err == DB_DUPLICATE_KEY) {
unknown's avatar
unknown committed
273
           	if (savept) {
274 275 276 277
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
unknown's avatar
unknown committed
278
		}
279
	} else if (err == DB_TOO_BIG_RECORD) {
unknown's avatar
unknown committed
280 281 282 283 284 285
           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
unknown's avatar
unknown committed
286
		/* MySQL will roll back the latest SQL statement */
287 288 289
	} else if (err == DB_ROW_IS_REFERENCED
		   || err == DB_NO_REFERENCED_ROW
		   || err == DB_CANNOT_ADD_CONSTRAINT) {
unknown's avatar
unknown committed
290 291 292 293 294 295
           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
296
		/* MySQL will roll back the latest SQL statement */
297 298
	} else if (err == DB_LOCK_WAIT) {

unknown's avatar
unknown committed
299
		srv_suspend_mysql_thread(thr);
300

unknown's avatar
unknown committed
301
		if (trx->error_state != DB_SUCCESS) {
302 303 304 305 306 307 308 309 310
			que_thr_stop_for_mysql(thr);

			goto handle_new_error;
		}

		*new_err = err;

		return(TRUE);

unknown's avatar
unknown committed
311 312
	} else if (err == DB_DEADLOCK || err == DB_LOCK_WAIT_TIMEOUT
		   || err == DB_LOCK_TABLE_FULL) {
313 314
		/* Roll back the whole transaction; this resolution was added
		to version 3.23.43 */
315

316 317
		trx_general_rollback_for_mysql(trx, FALSE, NULL);
				
318
	} else if (err == DB_OUT_OF_FILE_SPACE) {
unknown's avatar
unknown committed
319 320 321 322 323 324
           	if (savept) {
			/* Roll back the latest, possibly incomplete
			insertion or update */

			trx_general_rollback_for_mysql(trx, TRUE, savept);
		}
unknown's avatar
unknown committed
325
		/* MySQL will roll back the latest SQL statement */
326 327 328

	} else if (err == DB_MUST_GET_MORE_FILE_SPACE) {

329
		fputs(
unknown's avatar
unknown committed
330 331
		"InnoDB: The database cannot continue operation because of\n"
		"InnoDB: lack of space. You must add a new data file to\n"
332
		"InnoDB: my.cnf and restart the database.\n", stderr);
unknown's avatar
unknown committed
333 334
		
		exit(1);
unknown's avatar
unknown committed
335 336
	} else if (err == DB_CORRUPTION) {

unknown's avatar
unknown committed
337
	       fputs(
unknown's avatar
unknown committed
338 339 340 341 342
	    "InnoDB: We detected index corruption in an InnoDB type table.\n"
	    "InnoDB: You have to dump + drop + reimport the table or, in\n"
	    "InnoDB: a case of widespread corruption, dump all InnoDB\n"
	    "InnoDB: tables and recreate the whole InnoDB tablespace.\n"
	    "InnoDB: If the mysqld server crashes after the startup or when\n"
343 344 345
	    "InnoDB: you dump the tables, look at\n"
	    "InnoDB: http://dev.mysql.com/doc/mysql/en/Forcing_recovery.html"
	    " for help.\n", stderr);
unknown's avatar
unknown committed
346

347
	} else {
348 349
		fprintf(stderr, "InnoDB: unknown error code %lu\n",
			(ulong) err);
350
		ut_error;
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383
	}		

	if (trx->error_state != DB_SUCCESS) {
		*new_err = trx->error_state;
	} else {
		*new_err = err;
	}
	
	trx->error_state = DB_SUCCESS;

	return(FALSE);
}

/************************************************************************
Create a prebuilt struct for a MySQL table handle. */

row_prebuilt_t*
row_create_prebuilt(
/*================*/
				/* out, own: a prebuilt struct */
	dict_table_t*	table)	/* in: Innobase table handle */
{
	row_prebuilt_t*	prebuilt;
	mem_heap_t*	heap;
	dict_index_t*	clust_index;
	dtuple_t*	ref;
	ulint		ref_len;
	ulint		i;
	
	heap = mem_heap_create(128);

	prebuilt = mem_heap_alloc(heap, sizeof(row_prebuilt_t));

unknown's avatar
unknown committed
384
	prebuilt->magic_n = ROW_PREBUILT_ALLOCATED;
unknown's avatar
unknown committed
385
	prebuilt->magic_n2 = ROW_PREBUILT_ALLOCATED;
unknown's avatar
unknown committed
386

387 388 389 390 391 392
	prebuilt->table = table;

	prebuilt->trx = NULL;

	prebuilt->sql_stat_start = TRUE;

393 394
	prebuilt->mysql_has_locked = FALSE;

395
	prebuilt->index = NULL;
396 397 398

	prebuilt->used_in_HANDLER = FALSE;

399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
	prebuilt->n_template = 0;
	prebuilt->mysql_template = NULL;

	prebuilt->heap = heap;
	prebuilt->ins_node = NULL;

	prebuilt->ins_upd_rec_buff = NULL;
	
	prebuilt->upd_node = NULL;
	prebuilt->ins_graph = NULL;
	prebuilt->upd_graph = NULL;

  	prebuilt->pcur = btr_pcur_create_for_mysql();
  	prebuilt->clust_pcur = btr_pcur_create_for_mysql();

	prebuilt->select_lock_type = LOCK_NONE;
415
	prebuilt->stored_select_lock_type = 99999999;
416 417 418 419

	prebuilt->sel_graph = NULL;

	prebuilt->search_tuple = dtuple_create(heap,
unknown's avatar
unknown committed
420
					2 * dict_table_get_n_cols(table));
421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440
	
	clust_index = dict_table_get_first_index(table);

	ref_len = dict_index_get_n_unique(clust_index);

	ref = dtuple_create(heap, ref_len);

	dict_index_copy_types(ref, clust_index, ref_len);

	prebuilt->clust_ref = ref;

	for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) {
		prebuilt->fetch_cache[i] = NULL;
	}

	prebuilt->n_fetch_cached = 0;

	prebuilt->blob_heap = NULL;

	prebuilt->old_vers_heap = NULL;
unknown's avatar
unknown committed
441

442 443 444 445 446 447 448 449 450 451 452 453 454
	return(prebuilt);
}

/************************************************************************
Free a prebuilt struct for a MySQL table handle. */

void
row_prebuilt_free(
/*==============*/
	row_prebuilt_t*	prebuilt)	/* in, own: prebuilt struct */
{
	ulint	i;

unknown's avatar
unknown committed
455 456
	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED
	    || prebuilt->magic_n2 != ROW_PREBUILT_ALLOCATED) {
unknown's avatar
unknown committed
457
		fprintf(stderr,
unknown's avatar
unknown committed
458
"InnoDB: Error: trying to free a corrupt\n"
unknown's avatar
unknown committed
459
"InnoDB: table handle. Magic n %lu, magic n2 %lu, table name",
460
		(ulong) prebuilt->magic_n,
unknown's avatar
unknown committed
461
		(ulong) prebuilt->magic_n2);
462
		ut_print_name(stderr, NULL, prebuilt->table->name);
463
		putc('\n', stderr);
unknown's avatar
unknown committed
464 465 466

		mem_analyze_corruption((byte*)prebuilt);

467
		ut_error;
unknown's avatar
unknown committed
468 469 470
	}

	prebuilt->magic_n = ROW_PREBUILT_FREED;
unknown's avatar
unknown committed
471
	prebuilt->magic_n2 = ROW_PREBUILT_FREED;
unknown's avatar
unknown committed
472

473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
	btr_pcur_free_for_mysql(prebuilt->pcur);
	btr_pcur_free_for_mysql(prebuilt->clust_pcur);

	if (prebuilt->mysql_template) {
		mem_free(prebuilt->mysql_template);
	}

	if (prebuilt->ins_graph) {
		que_graph_free_recursive(prebuilt->ins_graph);
	}

	if (prebuilt->sel_graph) {
		que_graph_free_recursive(prebuilt->sel_graph);
	}
	
	if (prebuilt->upd_graph) {
		que_graph_free_recursive(prebuilt->upd_graph);
	}
	
	if (prebuilt->blob_heap) {
		mem_heap_free(prebuilt->blob_heap);
	}

	if (prebuilt->old_vers_heap) {
		mem_heap_free(prebuilt->old_vers_heap);
	}
	
	for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) {
		if (prebuilt->fetch_cache[i] != NULL) {
unknown's avatar
unknown committed
502 503 504 505 506 507

			if ((ROW_PREBUILT_FETCH_MAGIC_N !=
			    mach_read_from_4((prebuilt->fetch_cache[i]) - 4))
			    || (ROW_PREBUILT_FETCH_MAGIC_N !=
			    mach_read_from_4((prebuilt->fetch_cache[i])
			    			+ prebuilt->mysql_row_len))) {
508
				fputs(
unknown's avatar
unknown committed
509
			"InnoDB: Error: trying to free a corrupt\n"
510
			"InnoDB: fetch buffer.\n", stderr);
unknown's avatar
unknown committed
511 512 513 514

				mem_analyze_corruption(
						prebuilt->fetch_cache[i]);

515
				ut_error;
unknown's avatar
unknown committed
516 517 518
			}

			mem_free((prebuilt->fetch_cache[i]) - 4);
519 520 521
		}
	}

unknown's avatar
unknown committed
522 523
	dict_table_decrement_handle_count(prebuilt->table);

524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
	mem_heap_free(prebuilt->heap);
}

/*************************************************************************
Updates the transaction pointers in query graphs stored in the prebuilt
struct. */

void
row_update_prebuilt_trx(
/*====================*/
					/* out: prebuilt dtuple */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in MySQL
					handle */
	trx_t*		trx)		/* in: transaction handle */
{	
unknown's avatar
unknown committed
539
	if (trx->magic_n != TRX_MAGIC_N) {
unknown's avatar
unknown committed
540
		fprintf(stderr,
unknown's avatar
unknown committed
541 542
		"InnoDB: Error: trying to use a corrupt\n"
		"InnoDB: trx handle. Magic n %lu\n",
543
		(ulong) trx->magic_n);
unknown's avatar
unknown committed
544

unknown's avatar
unknown committed
545
		mem_analyze_corruption((byte*)trx);
unknown's avatar
unknown committed
546

547
		ut_error;
unknown's avatar
unknown committed
548 549 550 551 552
	}

	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to use a corrupt\n"
unknown's avatar
unknown committed
553 554
		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
555
		ut_print_name(stderr, NULL, prebuilt->table->name);
556
		putc('\n', stderr);
unknown's avatar
unknown committed
557 558 559

		mem_analyze_corruption((byte*)prebuilt);

560
		ut_error;
unknown's avatar
unknown committed
561 562
	}

563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
	prebuilt->trx = trx;

	if (prebuilt->ins_graph) {
		prebuilt->ins_graph->trx = trx;
	}

	if (prebuilt->upd_graph) {
		prebuilt->upd_graph->trx = trx;
	}

	if (prebuilt->sel_graph) {
		prebuilt->sel_graph->trx = trx;
	}	
}

/*************************************************************************
Gets pointer to a prebuilt dtuple used in insertions. If the insert graph
has not yet been built in the prebuilt struct, then this function first
builds it. */
static
dtuple_t*
row_get_prebuilt_insert_row(
/*========================*/
					/* out: prebuilt dtuple */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	ins_node_t*	node;
	dtuple_t*	row;
	dict_table_t*	table	= prebuilt->table;
unknown's avatar
unknown committed
593
	ulint		i;
594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616

	ut_ad(prebuilt && table && prebuilt->trx);
	
	if (prebuilt->ins_node == NULL) {

		/* Not called before for this handle: create an insert node
		and query graph to the prebuilt struct */

		node = ins_node_create(INS_DIRECT, table, prebuilt->heap);
		
		prebuilt->ins_node = node;

		if (prebuilt->ins_upd_rec_buff == NULL) {
			prebuilt->ins_upd_rec_buff = mem_heap_alloc(
						prebuilt->heap,
						prebuilt->mysql_row_len);
		}
		
		row = dtuple_create(prebuilt->heap,
					dict_table_get_n_cols(table));

		dict_table_copy_types(row, table);

unknown's avatar
unknown committed
617 618 619 620 621 622 623 624
		/* We init the value of every field to the SQL NULL to avoid
		a debug assertion from failing */

		for (i = 0; i < dtuple_get_n_fields(row); i++) {
		    
		        dtuple_get_nth_field(row, i)->len = UNIV_SQL_NULL;
		}

625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644
		ins_node_set_new_row(node, row);

		prebuilt->ins_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));
		prebuilt->ins_graph->state = QUE_FORK_ACTIVE;
	}

	return(prebuilt->ins_node->row);	
}

/*************************************************************************
Updates the table modification counter and calculates new estimates
for table and index statistics if necessary. */
UNIV_INLINE
void
row_update_statistics_if_needed(
/*============================*/
unknown's avatar
unknown committed
645
	dict_table_t*	table)	/* in: table */
646 647 648
{
	ulint	counter;
	
unknown's avatar
unknown committed
649
	counter = table->stat_modified_counter;
650

unknown's avatar
unknown committed
651
	table->stat_modified_counter = counter + 1;
652 653 654

	/* Calculate new statistics if 1 / 16 of table has been modified
	since the last time a statistics batch was run, or if
unknown's avatar
unknown committed
655 656 657
	stat_modified_counter > 2 000 000 000 (to avoid wrap-around).
	We calculate statistics at most every 16th round, since we may have
	a counter table which is very small and updated very often. */
658 659

	if (counter > 2000000000
unknown's avatar
unknown committed
660
	    || ((ib_longlong)counter > 16 + table->stat_n_rows / 16)) {
661

unknown's avatar
unknown committed
662
		dict_update_statistics(table);
663 664
	}	
}
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
		  	
/*************************************************************************
Unlocks an AUTO_INC type lock possibly reserved by trx. */

void		  	
row_unlock_table_autoinc_for_mysql(
/*===============================*/
	trx_t*	trx)	/* in: transaction */
{
	if (!trx->auto_inc_lock) {

		return;
	}

	lock_table_unlock_auto_inc(trx);
}

/*************************************************************************
Sets an AUTO_INC type lock on the table mentioned in prebuilt. The
AUTO_INC lock gives exclusive access to the auto-inc counter of the
table. The lock is reserved only for the duration of an SQL statement.
It is not compatible with another AUTO_INC or exclusive lock on the
table. */

int
row_lock_table_autoinc_for_mysql(
/*=============================*/
					/* out: error code or DB_SUCCESS */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in the MySQL
					table handle */
{
	trx_t*		trx 		= prebuilt->trx;
	ins_node_t*	node		= prebuilt->ins_node;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	
unknown's avatar
unknown committed
705 706 707 708 709
	if (trx->auto_inc_lock) {

		return(DB_SUCCESS);
	}

unknown's avatar
unknown committed
710
	trx->op_info = "setting auto-inc lock";
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729

	if (node == NULL) {
		row_get_prebuilt_insert_row(prebuilt);
		node = prebuilt->ins_node;
	}

	/* We use the insert query graph as the dummy graph needed
	in the lock module call */

	thr = que_fork_get_first_thr(prebuilt->ins_graph);

	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = node;
	thr->prev_node = node;

	/* It may be that the current session has not yet started
	its transaction, or it has been committed: */
730 731 732

	trx_start_if_not_started(trx);

733
	err = lock_table(0, prebuilt->table, LOCK_AUTO_INC, thr);
734 735 736 737 738 739 740 741 742 743 744 745

	trx->error_state = err;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL);

		if (was_lock_wait) {
			goto run_again;
		}

unknown's avatar
unknown committed
746
		trx->op_info = "";
747

748
		return((int) err);
749 750 751 752
	}

	que_thr_stop_for_mysql_no_error(thr, trx);

unknown's avatar
unknown committed
753
	trx->op_info = "";
754 755 756 757 758

	return((int) err);
}

/*************************************************************************
unknown's avatar
unknown committed
759 760
Unlocks all table locks explicitly requested by trx (with LOCK TABLES,
lock type LOCK_TABLE_EXP). */
761 762

void		  	
unknown's avatar
unknown committed
763 764
row_unlock_tables_for_mysql(
/*========================*/
765 766
	trx_t*	trx)	/* in: transaction */
{
unknown's avatar
unknown committed
767
	if (!trx->n_lock_table_exp) {
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

		return;
	}

	mutex_enter(&kernel_mutex);
	lock_release_tables_off_kernel(trx);
	mutex_exit(&kernel_mutex);
}
/*************************************************************************
Sets a table lock on the table mentioned in prebuilt. */

int
row_lock_table_for_mysql(
/*=====================*/
					/* out: error code or DB_SUCCESS */
783
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in the MySQL
784
					table handle */
785
	dict_table_t*	table,		/* in: table to lock, or NULL
786 787 788
					if prebuilt->table should be
					locked as LOCK_TABLE_EXP |
					prebuilt->select_lock_type */
789
	ulint		mode)		/* in: lock mode of table */
790 791 792 793 794 795 796 797 798
{
	trx_t*		trx 		= prebuilt->trx;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

unknown's avatar
unknown committed
799
	trx->op_info = "setting table lock";
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819

	if (prebuilt->sel_graph == NULL) {
		/* Build a dummy select query graph */
		row_prebuild_sel_graph(prebuilt);
	}

	/* We use the select query graph as the dummy graph needed
	in the lock module call */

	thr = que_fork_get_first_thr(prebuilt->sel_graph);

	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = thr;
	thr->prev_node = thr->common.parent;

	/* It may be that the current session has not yet started
	its transaction, or it has been committed: */

820 821
	trx_start_if_not_started(trx);

822
	if (table) {
823
		err = lock_table(0, table, mode, thr);
824 825 826 827
	} else {
		err = lock_table(LOCK_TABLE_EXP, prebuilt->table,
			prebuilt->select_lock_type, thr);
	}
828 829 830 831 832 833 834 835 836 837 838 839

	trx->error_state = err;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr, NULL);

		if (was_lock_wait) {
			goto run_again;
		}

unknown's avatar
unknown committed
840
		trx->op_info = "";
841

842
		return((int) err);
843 844 845 846
	}

	que_thr_stop_for_mysql_no_error(thr, trx);
		
unknown's avatar
unknown committed
847
	trx->op_info = "";
848

849 850 851
	return((int) err);	
}
					
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
/*************************************************************************
Does an insert for MySQL. */

int
row_insert_for_mysql(
/*=================*/
					/* out: error code or DB_SUCCESS */
	byte*		mysql_rec,	/* in: row in the MySQL format */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	trx_savept_t	savept;
	que_thr_t*	thr;
	ulint		err;
	ibool		was_lock_wait;
	trx_t*		trx 		= prebuilt->trx;
	ins_node_t*	node		= prebuilt->ins_node;
	
	ut_ad(trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
unknown's avatar
unknown committed
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886

	if (prebuilt->table->ibd_file_missing) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB: Error:\n"
"InnoDB: MySQL is trying to use a table handle but the .ibd file for\n"
"InnoDB: table %s does not exist.\n"
"InnoDB: Have you deleted the .ibd file from the database directory under\n"
"InnoDB: the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"InnoDB: Look from\n"
"http://dev.mysql.com/doc/mysql/en/InnoDB_troubleshooting_datadict.html\n"
"InnoDB: how you can resolve the problem.\n",
				prebuilt->table->name);
		return(DB_ERROR);
	}

unknown's avatar
unknown committed
887 888 889
	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to free a corrupt\n"
unknown's avatar
unknown committed
890 891
		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
892
		ut_print_name(stderr, prebuilt->trx, prebuilt->table->name);
893
		putc('\n', stderr);
unknown's avatar
unknown committed
894 895 896

		mem_analyze_corruption((byte*)prebuilt);

897
		ut_error;
unknown's avatar
unknown committed
898 899
	}

900
	if (srv_created_new_raw || srv_force_recovery) {
901
		fputs(
902 903 904 905
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
906 907
		"InnoDB: with raw, and innodb_force_... is removed.\n",
			stderr);
908 909 910 911

		return(DB_ERROR);
	}

unknown's avatar
unknown committed
912
	trx->op_info = "inserting";
913

914 915
	row_mysql_delay_if_needed();

unknown's avatar
Merge  
unknown committed
916 917
	trx_start_if_not_started(trx);

918 919 920 921 922
	if (node == NULL) {
		row_get_prebuilt_insert_row(prebuilt);
		node = prebuilt->ins_node;
	}

923 924
	row_mysql_convert_row_to_innobase(node->row, prebuilt, mysql_rec);
	
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	savept = trx_savept_take(trx);
	
	thr = que_fork_get_first_thr(prebuilt->ins_graph);

	if (prebuilt->sql_stat_start) {
		node->state = INS_NODE_SET_IX_LOCK;
		prebuilt->sql_stat_start = FALSE;
	} else {
		node->state = INS_NODE_ALLOC_ROW_ID;
	}
	
	que_thr_move_to_run_state_for_mysql(thr, trx);

run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_ins_step(thr);
	
	err = trx->error_state;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);

		was_lock_wait = row_mysql_handle_errors(&err, trx, thr,
								&savept);
		if (was_lock_wait) {
			goto run_again;
		}

unknown's avatar
unknown committed
955
		trx->op_info = "";
956

957
		return((int) err);
958 959 960 961 962 963
	}

	que_thr_stop_for_mysql_no_error(thr, trx);
	
	prebuilt->table->stat_n_rows++;

964 965
	srv_n_rows_inserted++;
	
966 967 968 969 970
	if (prebuilt->table->stat_n_rows == 0) {
		/* Avoid wrap-over */
		prebuilt->table->stat_n_rows--;
	}	

unknown's avatar
unknown committed
971
	row_update_statistics_if_needed(prebuilt->table);
unknown's avatar
unknown committed
972
	trx->op_info = "";
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003

	return((int) err);
}

/*************************************************************************
Builds a dummy query graph used in selects. */

void
row_prebuild_sel_graph(
/*===================*/
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	sel_node_t*	node;

	ut_ad(prebuilt && prebuilt->trx);
	
	if (prebuilt->sel_graph == NULL) {

		node = sel_node_create(prebuilt->heap);
				
		prebuilt->sel_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));

		prebuilt->sel_graph->state = QUE_FORK_ACTIVE;
	}
}

unknown's avatar
unknown committed
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
/*************************************************************************
Creates an query graph node of 'update' type to be used in the MySQL
interface. */

upd_node_t*
row_create_update_node_for_mysql(
/*=============================*/
				/* out, own: update node */
	dict_table_t*	table,	/* in: table to update */
	mem_heap_t*	heap)	/* in: mem heap from which allocated */
{
	upd_node_t*	node;

	node = upd_node_create(heap);
		
	node->in_mysql_interface = TRUE;
	node->is_delete = FALSE;
	node->searched_update = FALSE;
	node->select_will_do_update = FALSE;
	node->select = NULL;
	node->pcur = btr_pcur_create_for_mysql();
	node->table = table;

	node->update = upd_create(dict_table_get_n_cols(table), heap);

	node->update_n_fields = dict_table_get_n_cols(table);
	
	UT_LIST_INIT(node->columns);
	node->has_clust_rec_x_lock = TRUE;
	node->cmpl_info = 0;

	node->table_sym = NULL;
	node->col_assign_list = NULL;

	return(node);
}

1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
/*************************************************************************
Gets pointer to a prebuilt update vector used in updates. If the update
graph has not yet been built in the prebuilt struct, then this function
first builds it. */

upd_t*
row_get_prebuilt_update_vector(
/*===========================*/
					/* out: prebuilt update vector */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	dict_table_t*	table	= prebuilt->table;
	upd_node_t*	node;

	ut_ad(prebuilt && table && prebuilt->trx);
	
	if (prebuilt->upd_node == NULL) {

		/* Not called before for this handle: create an update node
		and query graph to the prebuilt struct */

unknown's avatar
unknown committed
1063
		node = row_create_update_node_for_mysql(table, prebuilt->heap);
1064

unknown's avatar
unknown committed
1065
		prebuilt->upd_node = node;
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
		
		prebuilt->upd_graph =
			que_node_get_parent(
				pars_complete_graph_for_exec(node,
							prebuilt->trx,
							prebuilt->heap));
		prebuilt->upd_graph->state = QUE_FORK_ACTIVE;
	}

	return(prebuilt->upd_node->update);
}

/*************************************************************************
Does an update or delete of a row for MySQL. */

int
row_update_for_mysql(
/*=================*/
					/* out: error code or DB_SUCCESS */
	byte*		mysql_rec,	/* in: the row to be updated, in
					the MySQL format */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
	trx_savept_t	savept;
	ulint		err;
	que_thr_t*	thr;
	ibool		was_lock_wait;
	dict_index_t*	clust_index; 
1095
/*	ulint		ref_len; */
1096 1097 1098
	upd_node_t*	node;
	dict_table_t*	table		= prebuilt->table;
	trx_t*		trx		= prebuilt->trx;
1099

1100 1101
	ut_ad(prebuilt && trx);
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
1102 1103
	UT_NOT_USED(mysql_rec);
	
unknown's avatar
unknown committed
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
	if (prebuilt->table->ibd_file_missing) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB: Error:\n"
"InnoDB: MySQL is trying to use a table handle but the .ibd file for\n"
"InnoDB: table %s does not exist.\n"
"InnoDB: Have you deleted the .ibd file from the database directory under\n"
"InnoDB: the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"InnoDB: Look from\n"
"http://dev.mysql.com/doc/mysql/en/InnoDB_troubleshooting_datadict.html\n"
"InnoDB: how you can resolve the problem.\n",
				prebuilt->table->name);
		return(DB_ERROR);
	}

unknown's avatar
unknown committed
1118 1119 1120
	if (prebuilt->magic_n != ROW_PREBUILT_ALLOCATED) {
		fprintf(stderr,
		"InnoDB: Error: trying to free a corrupt\n"
unknown's avatar
unknown committed
1121 1122
		"InnoDB: table handle. Magic n %lu, table name",
		(ulong) prebuilt->magic_n);
1123
		ut_print_name(stderr, prebuilt->trx, prebuilt->table->name);
1124
		putc('\n', stderr);
unknown's avatar
unknown committed
1125 1126 1127

		mem_analyze_corruption((byte*)prebuilt);

1128
		ut_error;
unknown's avatar
unknown committed
1129 1130
	}

1131
	if (srv_created_new_raw || srv_force_recovery) {
1132
		fputs(
1133 1134 1135 1136
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
1137 1138
		"InnoDB: with raw, and innodb_force_... is removed.\n",
			stderr);
1139 1140 1141 1142

		return(DB_ERROR);
	}

unknown's avatar
unknown committed
1143
	trx->op_info = "updating or deleting";
1144

1145 1146
	row_mysql_delay_if_needed();

unknown's avatar
Merge  
unknown committed
1147 1148
	trx_start_if_not_started(trx);

1149 1150 1151 1152
	node = prebuilt->upd_node;

	clust_index = dict_table_get_first_index(table);

1153
	if (prebuilt->pcur->btr_cur.index == clust_index) {
1154
		btr_pcur_copy_stored_position(node->pcur, prebuilt->pcur);
1155
	} else {
unknown's avatar
unknown committed
1156 1157
		btr_pcur_copy_stored_position(node->pcur,
							prebuilt->clust_pcur);
1158
	}
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
		
	ut_a(node->pcur->rel_pos == BTR_PCUR_ON);
	 	
	/* MySQL seems to call rnd_pos before updating each row it
	has cached: we can get the correct cursor position from
	prebuilt->pcur; NOTE that we cannot build the row reference
	from mysql_rec if the clustered index was automatically
	generated for the table: MySQL does not know anything about
	the row id used as the clustered index key */

1169 1170 1171 1172 1173 1174 1175 1176 1177
	savept = trx_savept_take(trx);
	
	thr = que_fork_get_first_thr(prebuilt->upd_graph);

	node->state = UPD_NODE_UPDATE_CLUSTERED;

	ut_ad(!prebuilt->sql_stat_start);

	que_thr_move_to_run_state_for_mysql(thr, trx);
unknown's avatar
unknown committed
1178

1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_upd_step(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		que_thr_stop_for_mysql(thr);
		
		if (err == DB_RECORD_NOT_FOUND) {
			trx->error_state = DB_SUCCESS;
unknown's avatar
unknown committed
1192
			trx->op_info = "";
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202

			return((int) err);
		}
	
		was_lock_wait = row_mysql_handle_errors(&err, trx, thr,
								&savept);
		if (was_lock_wait) {
			goto run_again;
		}

unknown's avatar
unknown committed
1203
		trx->op_info = "";
1204

1205
		return((int) err);
1206 1207 1208 1209
	}

	que_thr_stop_for_mysql_no_error(thr, trx);

unknown's avatar
unknown committed
1210
	if (node->is_delete) {
1211 1212 1213
		if (prebuilt->table->stat_n_rows > 0) {
			prebuilt->table->stat_n_rows--;
		}
1214 1215 1216 1217 1218

		srv_n_rows_deleted++;
	} else {
		srv_n_rows_updated++;
	}
1219

unknown's avatar
unknown committed
1220
	row_update_statistics_if_needed(prebuilt->table);
1221

unknown's avatar
unknown committed
1222
	trx->op_info = "";
1223

1224 1225 1226
	return((int) err);
}

unknown's avatar
unknown committed
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
/**************************************************************************
Does a cascaded delete or set null in a foreign key operation. */

ulint
row_update_cascade_for_mysql(
/*=========================*/
				/* out: error code or DB_SUCCESS */
	que_thr_t*	thr,	/* in: query thread */
	upd_node_t*	node,	/* in: update node used in the cascade
				or set null operation */
	dict_table_t*	table)	/* in: table where we do the operation */
{
unknown's avatar
unknown committed
1239 1240
	ulint	err;
	trx_t*	trx;
unknown's avatar
unknown committed
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250

	trx = thr_get_trx(thr);
run_again:
	thr->run_node = node;
	thr->prev_node = node;

	row_upd_step(thr);

	err = trx->error_state;

unknown's avatar
unknown committed
1251 1252 1253 1254
	/* Note that the cascade node is a subnode of another InnoDB
	query graph node. We do a normal lock wait in this node, but
	all errors are handled by the parent node. */

unknown's avatar
unknown committed
1255
	if (err == DB_LOCK_WAIT) {
unknown's avatar
unknown committed
1256
		/* Handle lock wait here */
unknown's avatar
unknown committed
1257
	
unknown's avatar
unknown committed
1258 1259 1260
		que_thr_stop_for_mysql(thr);

		srv_suspend_mysql_thread(thr);
unknown's avatar
unknown committed
1261

unknown's avatar
unknown committed
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
		/* Note that a lock wait may also end in a lock wait timeout,
		or this transaction is picked as a victim in selective
		deadlock resolution */

		if (trx->error_state != DB_SUCCESS) {

			return(trx->error_state);
		}

		/* Retry operation after a normal lock wait */
		
unknown's avatar
unknown committed
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		goto run_again;
	}

	if (err != DB_SUCCESS) {

		return(err);
	}

	if (node->is_delete) {
		if (table->stat_n_rows > 0) {
			table->stat_n_rows--;
		}

		srv_n_rows_deleted++;
	} else {
		srv_n_rows_updated++;
	}

	row_update_statistics_if_needed(table);

	return(err);
}

1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
/*************************************************************************
Checks if a table is such that we automatically created a clustered
index on it (on row id). */

ibool
row_table_got_default_clust_index(
/*==============================*/
	dict_table_t*	table)
{
	dict_index_t*	clust_index;

	clust_index = dict_table_get_first_index(table);

	if (dtype_get_mtype(dict_index_get_nth_type(clust_index, 0))
	 							== DATA_SYS) {
	 	return(TRUE);
	}

	return(FALSE);
}

1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
/*************************************************************************
Calculates the key number used inside MySQL for an Innobase index. We have
to take into account if we generated a default clustered index for the table */

ulint
row_get_mysql_key_number_for_index(
/*===============================*/
	dict_index_t*	index)
{
	dict_index_t*	ind;
	ulint		i;

	ut_a(index);

	i = 0;
	ind = dict_table_get_first_index(index->table);

	while (index != ind) {
		ind = dict_table_get_next_index(ind);
		i++;
	}

	if (row_table_got_default_clust_index(index->table)) {
		ut_a(i > 0);
		i--;
	}

	return(i);
}

unknown's avatar
unknown committed
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
/*************************************************************************
Recovers an orphaned tmp table inside InnoDB by renaming it. In the table
name #sql becomes rsql, and "_recover_innodb_tmp_table" is catenated to
the end of name. table->name should be of the form
"dbname/rsql..._recover_innodb_tmp_table". This renames a table whose
name is "#sql..." */
static
int
row_mysql_recover_tmp_table(
/*========================*/
				/* out: error code or DB_SUCCESS */
	dict_table_t*	table,	/* in: table definition */
	trx_t*		trx)	/* in: transaction handle */
{
1361
	const char*	ptr	= strstr(table->name, "/rsql");
unknown's avatar
unknown committed
1362

1363 1364 1365 1366 1367 1368 1369
	if (!ptr) {
		/* table name does not begin with "/rsql" */
		trx_commit_for_mysql(trx);
		return(DB_ERROR);
	}
	else {
		int	status;
1370
		int	namelen = (int) strlen(table->name);
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
		char*	old_name = mem_strdupl(table->name, namelen);
		/* replace "rsql" with "#sql" */
		old_name[ptr - table->name + 1] = '#';
		/* remove "_recover_innodb_tmp_table" suffix */
		ut_ad(namelen > (int) sizeof S_recover_innodb_tmp_table);
		ut_ad(!strcmp(old_name + namelen + 1 -
			sizeof S_recover_innodb_tmp_table,
			S_recover_innodb_tmp_table));
		old_name[namelen + 1 - sizeof S_recover_innodb_tmp_table] = 0;
		status = row_rename_table_for_mysql(old_name,
						table->name, trx);
		mem_free(old_name);
		return(status);
unknown's avatar
unknown committed
1384 1385 1386
	}
}

unknown's avatar
unknown committed
1387
/*************************************************************************
unknown's avatar
unknown committed
1388 1389
Locks the data dictionary in shared mode from modifications, for performing
foreign key check, rollback, or other operation invisible to MySQL. */
unknown's avatar
unknown committed
1390 1391

void
unknown's avatar
unknown committed
1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
row_mysql_freeze_data_dictionary(
/*=============================*/
	trx_t*	trx)	/* in: transaction */
{
	ut_a(trx->dict_operation_lock_mode == 0);
	
	rw_lock_s_lock(&dict_operation_lock);

	trx->dict_operation_lock_mode = RW_S_LATCH;
}

/*************************************************************************
Unlocks the data dictionary shared lock. */

void
row_mysql_unfreeze_data_dictionary(
/*===============================*/
	trx_t*	trx)	/* in: transaction */
unknown's avatar
unknown committed
1410
{
unknown's avatar
unknown committed
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
	ut_a(trx->dict_operation_lock_mode == RW_S_LATCH);

	rw_lock_s_unlock(&dict_operation_lock);

	trx->dict_operation_lock_mode = 0;
}

/*************************************************************************
Locks the data dictionary exclusively for performing a table create or other
data dictionary modification operation. */

void
row_mysql_lock_data_dictionary(
/*===========================*/
	trx_t*	trx)	/* in: transaction */
{
unknown's avatar
unknown committed
1427 1428
	ut_a(trx->dict_operation_lock_mode == 0
	     || trx->dict_operation_lock_mode == RW_X_LATCH);
unknown's avatar
unknown committed
1429
	
unknown's avatar
unknown committed
1430 1431 1432
	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks or lock waits can occur then in these operations */

unknown's avatar
unknown committed
1433
	rw_lock_x_lock(&dict_operation_lock);
unknown's avatar
unknown committed
1434 1435
	trx->dict_operation_lock_mode = RW_X_LATCH;

unknown's avatar
unknown committed
1436 1437 1438 1439
	mutex_enter(&(dict_sys->mutex));
}

/*************************************************************************
unknown's avatar
unknown committed
1440
Unlocks the data dictionary exclusive lock. */
unknown's avatar
unknown committed
1441 1442

void
unknown's avatar
unknown committed
1443 1444 1445
row_mysql_unlock_data_dictionary(
/*=============================*/
	trx_t*	trx)	/* in: transaction */
unknown's avatar
unknown committed
1446
{
unknown's avatar
unknown committed
1447 1448
	ut_a(trx->dict_operation_lock_mode == RW_X_LATCH);

unknown's avatar
unknown committed
1449 1450 1451 1452
	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	mutex_exit(&(dict_sys->mutex));
unknown's avatar
unknown committed
1453
	rw_lock_x_unlock(&dict_operation_lock);
unknown's avatar
unknown committed
1454 1455

	trx->dict_operation_lock_mode = 0;
unknown's avatar
unknown committed
1456 1457
}

1458
/*************************************************************************
1459 1460 1461 1462
Does a table creation operation for MySQL.  If the name of the table
to be created is equal with one of the predefined magic table names,
then this also starts printing the corresponding monitor output by
the master thread. */
unknown's avatar
unknown committed
1463

1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
int
row_create_table_for_mysql(
/*=======================*/
				/* out: error code or DB_SUCCESS */
	dict_table_t*	table,	/* in: table definition */
	trx_t*		trx)	/* in: transaction handle */
{
	tab_node_t*	node;
	mem_heap_t*	heap;
	que_thr_t*	thr;
1474 1475
	const char*	table_name;
	ulint		table_name_len;
1476
	ulint		err;
unknown's avatar
unknown committed
1477
	ulint		i;
1478 1479

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
1480
#ifdef UNIV_SYNC_DEBUG
unknown's avatar
unknown committed
1481
	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
unknown's avatar
unknown committed
1482
	ut_ad(mutex_own(&(dict_sys->mutex)));
1483 1484
#endif /* UNIV_SYNC_DEBUG */
	ut_ad(trx->dict_operation_lock_mode == RW_X_LATCH);
1485
	
unknown's avatar
unknown committed
1486
	if (srv_created_new_raw) {
1487
		fputs(
1488 1489 1490 1491
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
1492 1493
		"InnoDB: with raw, and innodb_force_... is removed.\n",
		stderr);
1494

unknown's avatar
unknown committed
1495 1496
		trx_commit_for_mysql(trx);

1497 1498 1499
		return(DB_ERROR);
	}

unknown's avatar
unknown committed
1500
	trx->op_info = "creating table";
unknown's avatar
unknown committed
1501
	
1502 1503
	if (row_mysql_is_system_table(table->name)) {

unknown's avatar
unknown committed
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
		fprintf(stderr,
    "InnoDB: Error: trying to create a MySQL system table %s of type InnoDB.\n"
    "InnoDB: MySQL system tables must be of the MyISAM type!\n",
		table->name);

		trx_commit_for_mysql(trx);

		return(DB_ERROR);
	}

unknown's avatar
unknown committed
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
	/* Check that no reserved column names are used. */
	for (i = 0; i < dict_table_get_n_user_cols(table); i++) {
		dict_col_t*	col = dict_table_get_nth_col(table, i);

		if (dict_col_name_is_reserved(col->name)) {

			dict_mem_table_free(table);
			trx_commit_for_mysql(trx);

			return(DB_ERROR);
		}
	}

unknown's avatar
Merge  
unknown committed
1527 1528
	trx_start_if_not_started(trx);

1529
	if (row_mysql_is_recovered_tmp_table(table->name)) {
unknown's avatar
unknown committed
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540

		/* MySQL prevents accessing of tables whose name begins
		with #sql, that is temporary tables. If mysqld crashes in
		the middle of an ALTER TABLE, we may get an orphaned
		#sql-table in the tablespace. We have here a special
		mechanism to recover such tables by renaming them to
		rsql... */
 				
		return(row_mysql_recover_tmp_table(table, trx));
	}

1541 1542 1543 1544 1545 1546 1547 1548
	/* The table name is prefixed with the database name and a '/'.
	Certain table names starting with 'innodb_' have their special
	meaning regardless of the database name.  Thus, we need to
	ignore the database name prefix in the comparisons. */
	table_name = strchr(table->name, '/');
	ut_a(table_name);
	table_name++;
	table_name_len = strlen(table_name) + 1;
1549

1550 1551
	if (table_name_len == sizeof S_innodb_monitor
			&& !memcmp(table_name, S_innodb_monitor,
1552
				sizeof S_innodb_monitor)) {
1553

1554
		/* Table equals "innodb_monitor":
1555 1556 1557 1558 1559 1560 1561 1562
		start monitor prints */
 				
		srv_print_innodb_monitor = TRUE;

		/* The lock timeout monitor thread also takes care
		of InnoDB monitor prints */

		os_event_set(srv_lock_timeout_thread_event);
1563 1564
	} else if (table_name_len == sizeof S_innodb_lock_monitor
			&& !memcmp(table_name, S_innodb_lock_monitor,
1565
				sizeof S_innodb_lock_monitor)) {
1566 1567 1568 1569

		srv_print_innodb_monitor = TRUE;
		srv_print_innodb_lock_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
1570 1571
	} else if (table_name_len == sizeof S_innodb_tablespace_monitor
			&& !memcmp(table_name, S_innodb_tablespace_monitor,
1572
				sizeof S_innodb_tablespace_monitor)) {
1573 1574 1575

		srv_print_innodb_tablespace_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
1576 1577
	} else if (table_name_len == sizeof S_innodb_table_monitor
			&& !memcmp(table_name, S_innodb_table_monitor,
1578
				sizeof S_innodb_table_monitor)) {
1579 1580 1581

		srv_print_innodb_table_monitor = TRUE;
		os_event_set(srv_lock_timeout_thread_event);
1582 1583
	} else if (table_name_len == sizeof S_innodb_mem_validate
			&& !memcmp(table_name, S_innodb_mem_validate,
1584
				sizeof S_innodb_mem_validate)) {
1585 1586 1587
	        /* We define here a debugging feature intended for
		developers */

1588
		fputs("Validating InnoDB memory:\n"
1589 1590 1591
		 "to use this feature you must compile InnoDB with\n"
		 "UNIV_MEM_DEBUG defined in univ.i and the server must be\n"
		 "quiet because allocation from a mem heap is not protected\n"
1592
		"by any semaphore.\n", stderr);
unknown's avatar
unknown committed
1593
#ifdef UNIV_MEM_DEBUG
1594
		ut_a(mem_validate());
1595
		fputs("Memory validated\n", stderr);
unknown's avatar
unknown committed
1596
#else /* UNIV_MEM_DEBUG */
1597 1598
		fputs("Memory NOT validated (recompile with UNIV_MEM_DEBUG)\n",
			stderr);
unknown's avatar
unknown committed
1599
#endif /* UNIV_MEM_DEBUG */
1600 1601
	}

1602 1603 1604 1605 1606 1607 1608 1609
	heap = mem_heap_create(512);

	trx->dict_operation = TRUE;
	
	node = tab_create_graph_create(table, heap);

	thr = pars_complete_graph_for_exec(node, trx, heap);

unknown's avatar
unknown committed
1610
	ut_a(thr == que_fork_start_command(que_node_get_parent(thr)));
1611 1612 1613 1614 1615 1616
	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		/* We have special error handling here */
1617
		
1618 1619 1620 1621
		trx->error_state = DB_SUCCESS;
		
		trx_general_rollback_for_mysql(trx, FALSE, NULL);

1622
		if (err == DB_OUT_OF_FILE_SPACE) {
unknown's avatar
unknown committed
1623 1624 1625 1626
	    		ut_print_timestamp(stderr);

			fputs("  InnoDB: Warning: cannot create table ", 
								stderr);
1627
			ut_print_name(stderr, trx, table->name);
1628
			fputs(" because tablespace full\n", stderr);
unknown's avatar
unknown committed
1629 1630 1631 1632 1633 1634

			if (dict_table_get_low(table->name)) {

		     		row_drop_table_for_mysql(table->name, trx,
								FALSE);
			}
unknown's avatar
unknown committed
1635

unknown's avatar
unknown committed
1636
		} else if (err == DB_DUPLICATE_KEY) {
unknown's avatar
unknown committed
1637 1638
	    		ut_print_timestamp(stderr);

1639
			fputs("  InnoDB: Error: table ", stderr);
1640
			ut_print_name(stderr, trx, table->name);
1641
			fputs(" already exists in InnoDB internal\n"
1642
     "InnoDB: data dictionary. Have you deleted the .frm file\n"
unknown's avatar
unknown committed
1643
     "InnoDB: and not used DROP TABLE? Have you used DROP DATABASE\n"
1644
     "InnoDB: for InnoDB tables in MySQL version <= 3.23.43?\n"
1645
     "InnoDB: See the Restrictions section of the InnoDB manual.\n"
1646 1647
     "InnoDB: You can drop the orphaned table inside InnoDB by\n"
     "InnoDB: creating an InnoDB table with the same name in another\n"
unknown's avatar
unknown committed
1648
     "InnoDB: database and copying the .frm file to the current database.\n"
1649
     "InnoDB: Then MySQL thinks the table exists, and DROP TABLE will\n"
unknown's avatar
unknown committed
1650
     "InnoDB: succeed.\n"
1651 1652 1653
     "InnoDB: You can look for further help from\n"
     "InnoDB: http://dev.mysql.com/doc/mysql/en/"
     "InnoDB_troubleshooting_datadict.html\n", stderr);
1654
		}
unknown's avatar
unknown committed
1655 1656 1657
		
		/* We may also get err == DB_ERROR if the .ibd file for the
		table already exists */
1658 1659 1660 1661 1662

		trx->error_state = DB_SUCCESS;
	}

	que_graph_free((que_t*) que_node_get_parent(thr));
1663

unknown's avatar
unknown committed
1664
	trx->op_info = "";
1665

1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
	return((int) err);
}

/*************************************************************************
Does an index creation operation for MySQL. TODO: currently failure
to create an index results in dropping the whole table! This is no problem
currently as all indexes must be created at the same time as the table. */

int
row_create_index_for_mysql(
/*=======================*/
					/* out: error number or DB_SUCCESS */
unknown's avatar
unknown committed
1678
	dict_index_t*	index,		/* in: index definition */
1679 1680 1681 1682 1683 1684
	trx_t*		trx)		/* in: transaction handle */
{
	ind_node_t*	node;
	mem_heap_t*	heap;
	que_thr_t*	thr;
	ulint		err;
unknown's avatar
unknown committed
1685
	ulint		i, j;
unknown's avatar
unknown committed
1686
	
1687
#ifdef UNIV_SYNC_DEBUG
unknown's avatar
unknown committed
1688
	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
unknown's avatar
unknown committed
1689
	ut_ad(mutex_own(&(dict_sys->mutex)));
1690
#endif /* UNIV_SYNC_DEBUG */
1691 1692
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	
unknown's avatar
unknown committed
1693
	trx->op_info = "creating index";
1694

unknown's avatar
unknown committed
1695 1696
	trx_start_if_not_started(trx);

unknown's avatar
unknown committed
1697
	/* Check that the same column does not appear twice in the index.
unknown's avatar
unknown committed
1698
	Starting from 4.0.14, InnoDB should be able to cope with that, but
unknown's avatar
unknown committed
1699
	safer not to allow them. */
unknown's avatar
unknown committed
1700 1701 1702 1703 1704 1705 1706 1707 1708

	for (i = 0; i < dict_index_get_n_fields(index); i++) {
		for (j = 0; j < i; j++) {
			if (0 == ut_strcmp(
			      dict_index_get_nth_field(index, j)->name,
			      dict_index_get_nth_field(index, i)->name)) {

				ut_print_timestamp(stderr);

1709
				fputs("  InnoDB: Error: column ", stderr);
1710
				ut_print_name(stderr, trx,
1711 1712
				dict_index_get_nth_field(index, i)->name);
				fputs(" appears twice in ", stderr);
1713
				dict_index_name_print(stderr, trx, index);
1714 1715 1716
				fputs("\n"
				"InnoDB: This is not allowed in InnoDB.\n",
					stderr);
unknown's avatar
unknown committed
1717 1718 1719 1720 1721 1722

				err = DB_COL_APPEARS_TWICE_IN_INDEX;

				goto error_handling;
			}
		}
unknown's avatar
unknown committed
1723 1724
		
		/* Check also that prefix_len < DICT_MAX_COL_PREFIX_LEN */
unknown's avatar
unknown committed
1725

unknown's avatar
unknown committed
1726 1727 1728 1729 1730 1731 1732
		if (dict_index_get_nth_field(index, i)->prefix_len
						>= DICT_MAX_COL_PREFIX_LEN) {
			err = DB_TOO_BIG_RECORD;

			goto error_handling;
		}
	}
unknown's avatar
unknown committed
1733

1734
	if (row_mysql_is_recovered_tmp_table(index->table_name)) {
unknown's avatar
unknown committed
1735 1736 1737 1738

		return(DB_SUCCESS);
	}

1739 1740 1741 1742
	heap = mem_heap_create(512);

	trx->dict_operation = TRUE;

unknown's avatar
unknown committed
1743 1744 1745
	/* Note that the space id where we store the index is inherited from
	the table in dict_build_index_def_step() in dict0crea.c. */

1746 1747 1748 1749
	node = ind_create_graph_create(index, heap);

	thr = pars_complete_graph_for_exec(node, trx, heap);

unknown's avatar
unknown committed
1750
	ut_a(thr == que_fork_start_command(que_node_get_parent(thr)));
1751 1752
	que_run_threads(thr);

unknown's avatar
unknown committed
1753 1754 1755
 	err = trx->error_state;

	que_graph_free((que_t*) que_node_get_parent(thr));
1756

unknown's avatar
unknown committed
1757
error_handling:
1758 1759 1760 1761 1762 1763 1764
	if (err != DB_SUCCESS) {
		/* We have special error handling here */
		
		trx->error_state = DB_SUCCESS;

		trx_general_rollback_for_mysql(trx, FALSE, NULL);

1765
		row_drop_table_for_mysql(index->table_name, trx, FALSE);
1766 1767 1768 1769

		trx->error_state = DB_SUCCESS;
	}
	
unknown's avatar
unknown committed
1770
	trx->op_info = "";
1771

1772 1773 1774
	return((int) err);
}

1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
/*************************************************************************
Scans a table create SQL string and adds to the data dictionary
the foreign key constraints declared in the string. This function
should be called after the indexes for a table have been created.
Each foreign key constraint must be accompanied with indexes in
bot participating tables. The indexes are allowed to contain more
fields than mentioned in the constraint. Check also that foreign key
constraints which reference this table are ok. */

int
row_table_add_foreign_constraints(
/*==============================*/
1787 1788 1789 1790
					/* out: error code or DB_SUCCESS */
	trx_t*		trx,		/* in: transaction */
	const char*	sql_string,	/* in: table create statement where
					foreign keys are declared like:
1791
				FOREIGN KEY (a, b) REFERENCES table2(c, d),
1792 1793 1794 1795 1796
					table2 can be written also with the
					database name before it: test.table2 */
	const char*	name)		/* in: table full name in the
					normalized form
					database_name/table_name */
1797 1798 1799
{
	ulint	err;

1800
#ifdef UNIV_SYNC_DEBUG
unknown's avatar
unknown committed
1801
	ut_ad(mutex_own(&(dict_sys->mutex)));
unknown's avatar
unknown committed
1802
	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
1803
#endif /* UNIV_SYNC_DEBUG */
1804 1805
	ut_a(sql_string);
	
unknown's avatar
unknown committed
1806
	trx->op_info = "adding foreign keys";
1807

unknown's avatar
Merge  
unknown committed
1808 1809
	trx_start_if_not_started(trx);

1810
	if (row_mysql_is_recovered_tmp_table(name)) {
unknown's avatar
unknown committed
1811 1812 1813 1814

		return(DB_SUCCESS);
	}

1815 1816 1817 1818 1819 1820
	trx->dict_operation = TRUE;

	err = dict_create_foreign_constraints(trx, sql_string, name);

	if (err == DB_SUCCESS) {
		/* Check that also referencing constraints are ok */
1821
		err = dict_load_foreigns(name, TRUE);
1822 1823 1824 1825 1826 1827 1828 1829 1830
	}

	if (err != DB_SUCCESS) {
		/* We have special error handling here */
		
		trx->error_state = DB_SUCCESS;

		trx_general_rollback_for_mysql(trx, FALSE, NULL);

1831
		row_drop_table_for_mysql(name, trx, FALSE);
1832 1833 1834 1835 1836 1837 1838

		trx->error_state = DB_SUCCESS;
	}

	return((int) err);
}

unknown's avatar
unknown committed
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
/*************************************************************************
Drops a table for MySQL as a background operation. MySQL relies on Unix
in ALTER TABLE to the fact that the table handler does not remove the
table before all handles to it has been removed. Furhermore, the MySQL's
call to drop table must be non-blocking. Therefore we do the drop table
as a background operation, which is taken care of by the master thread
in srv0srv.c. */
static
int
row_drop_table_for_mysql_in_background(
/*===================================*/
unknown's avatar
unknown committed
1850 1851
				/* out: error code or DB_SUCCESS */
	const char*	name)	/* in: table name */
unknown's avatar
unknown committed
1852 1853 1854 1855 1856 1857
{
	ulint	error;
	trx_t*	trx;

	trx = trx_allocate_for_background();

unknown's avatar
unknown committed
1858 1859 1860 1861 1862 1863
	/* If the original transaction was dropping a table referenced by
	foreign keys, we must set the following to be able to drop the
	table: */

	trx->check_foreigns = FALSE;

1864 1865 1866 1867
/*	fputs("InnoDB: Error: Dropping table ", stderr);
	ut_print_name(stderr, name);
	fputs(" in background drop list\n", stderr); */

unknown's avatar
unknown committed
1868
  	/* Try to drop the table in InnoDB */
unknown's avatar
unknown committed
1869

1870
  	error = row_drop_table_for_mysql(name, trx, FALSE);
unknown's avatar
unknown committed
1871 1872 1873 1874 1875
  	
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
	
unknown's avatar
unknown committed
1876
	log_buffer_flush_to_disk();
unknown's avatar
unknown committed
1877 1878 1879 1880 1881

  	trx_commit_for_mysql(trx);

  	trx_free_for_background(trx);

1882
	return((int) error);
unknown's avatar
unknown committed
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
}

/*************************************************************************
The master thread in srv0srv.c calls this regularly to drop tables which
we must drop in background after queries to them have ended. Such lazy
dropping of tables is needed in ALTER TABLE on Unix. */

ulint
row_drop_tables_for_mysql_in_background(void)
/*=========================================*/
					/* out: how many tables dropped
					+ remaining tables in list */
{
	row_mysql_drop_t*	drop;
	dict_table_t*		table;
	ulint			n_tables;
	ulint			n_tables_dropped = 0;
loop:	
	mutex_enter(&kernel_mutex);

	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}

	drop = UT_LIST_GET_FIRST(row_mysql_drop_list);
	
	n_tables = UT_LIST_GET_LEN(row_mysql_drop_list);

	mutex_exit(&kernel_mutex);

	if (drop == NULL) {
unknown's avatar
unknown committed
1916
		/* All tables dropped */
unknown's avatar
unknown committed
1917 1918 1919 1920 1921 1922 1923 1924

		return(n_tables + n_tables_dropped);
	}

	mutex_enter(&(dict_sys->mutex));
	table = dict_table_get_low(drop->table_name);
	mutex_exit(&(dict_sys->mutex));

1925 1926 1927 1928 1929 1930
	if (table == NULL) {
	        /* If for some reason the table has already been dropped
		through some other mechanism, do not try to drop it */

	        goto already_dropped;
	}
unknown's avatar
unknown committed
1931 1932 1933 1934 1935
							
	if (DB_SUCCESS != row_drop_table_for_mysql_in_background(
							drop->table_name)) {
		/* If the DROP fails for some table, we return, and let the
		main thread retry later */
unknown's avatar
unknown committed
1936 1937 1938 1939 1940 1941

		return(n_tables + n_tables_dropped);
	}

	n_tables_dropped++;

1942
already_dropped:
unknown's avatar
unknown committed
1943 1944 1945 1946
	mutex_enter(&kernel_mutex);

	UT_LIST_REMOVE(row_mysql_drop_list, row_mysql_drop_list, drop);

1947
        ut_print_timestamp(stderr);
1948 1949 1950
	fprintf(stderr,
		"  InnoDB: Dropped table %s in background drop queue.\n",
		drop->table_name);
1951

unknown's avatar
unknown committed
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
	mem_free(drop->table_name);

	mem_free(drop);

	mutex_exit(&kernel_mutex);

	goto loop;
}

/*************************************************************************
Get the background drop list length. NOTE: the caller must own the kernel
mutex! */

ulint
row_get_background_drop_list_len_low(void)
/*======================================*/
					/* out: how many tables in list */
{
1970
#ifdef UNIV_SYNC_DEBUG
unknown's avatar
unknown committed
1971
	ut_ad(mutex_own(&kernel_mutex));
1972
#endif /* UNIV_SYNC_DEBUG */
unknown's avatar
unknown committed
1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983

	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}
	
	return(UT_LIST_GET_LEN(row_mysql_drop_list));
}

/*************************************************************************
unknown's avatar
unknown committed
1984 1985 1986 1987 1988
If a table is not yet in the drop list, adds the table to the list of tables
which the master thread drops in background. We need this on Unix because in
ALTER TABLE MySQL may call drop table even if the table has running queries on
it. Also, if there are running foreign key checks on the table, we drop the
table lazily. */
unknown's avatar
unknown committed
1989
static
unknown's avatar
unknown committed
1990
ibool
unknown's avatar
unknown committed
1991 1992
row_add_table_to_background_drop_list(
/*==================================*/
unknown's avatar
unknown committed
1993 1994
				/* out: TRUE if the table was not yet in the
				drop list, and was added there */
unknown's avatar
unknown committed
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
	dict_table_t*	table)	/* in: table */
{
	row_mysql_drop_t*	drop;
	
	mutex_enter(&kernel_mutex);

	if (!row_mysql_drop_list_inited) {

		UT_LIST_INIT(row_mysql_drop_list);
		row_mysql_drop_list_inited = TRUE;
	}
unknown's avatar
unknown committed
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
	
	/* Look if the table already is in the drop list */
	drop = UT_LIST_GET_FIRST(row_mysql_drop_list);

	while (drop != NULL) {
		if (strcmp(drop->table_name, table->name) == 0) {
			/* Already in the list */
			
			mutex_exit(&kernel_mutex);

			return(FALSE);
		}

		drop = UT_LIST_GET_NEXT(row_mysql_drop_list, drop);
	}
unknown's avatar
unknown committed
2021

unknown's avatar
unknown committed
2022 2023 2024 2025
	drop = mem_alloc(sizeof(row_mysql_drop_t));

	drop->table_name = mem_strdup(table->name);
 
unknown's avatar
unknown committed
2026 2027
	UT_LIST_ADD_LAST(row_mysql_drop_list, row_mysql_drop_list, drop);
	
2028 2029 2030 2031
/*	fputs("InnoDB: Adding table ", stderr);
	ut_print_name(stderr, drop->table_name);
	fputs(" to background drop list\n", stderr); */

unknown's avatar
unknown committed
2032
	mutex_exit(&kernel_mutex);
unknown's avatar
unknown committed
2033 2034

	return(TRUE);
unknown's avatar
unknown committed
2035 2036
}

unknown's avatar
unknown committed
2037 2038 2039
/*************************************************************************
Discards the tablespace of a table which stored in an .ibd file. Discarding
means that this function deletes the .ibd file and assigns a new table id for
unknown's avatar
unknown committed
2040
the table. Also the flag table->ibd_file_missing is set TRUE. */
unknown's avatar
unknown committed
2041

unknown's avatar
unknown committed
2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
int
row_discard_tablespace_for_mysql(
/*=============================*/
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx)	/* in: transaction handle */
{
	dict_foreign_t*	foreign;
	dulint		new_id;
	dict_table_t*	table;
	que_thr_t*	thr;
	que_t*		graph			= NULL;
	ibool		success;
	ulint		err;
	char*		buf;

/* How do we prevent crashes caused by ongoing operations on the table? Old
unknown's avatar
unknown committed
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
operations could try to access non-existent pages.

1) SQL queries, INSERT, SELECT, ...: we must get an exclusive MySQL table lock
on the table before we can do DISCARD TABLESPACE. Then there are no running
queries on the table.
2) Purge and rollback: we assign a new table id for the table. Since purge and
rollback look for the table based on the table id, they see the table as
'dropped' and discard their operations.
3) Insert buffer: we remove all entries for the tablespace in the insert
buffer tree; as long as the tablespace mem object does not exist, ongoing
insert buffer page merges are discarded in buf0rea.c. If we recreate the
tablespace mem object with IMPORT TABLESPACE later, then the tablespace will
have the same id, but the tablespace_version field in the mem object is
different, and ongoing old insert buffer page merges get discarded.
4) Linear readahead and random readahead: we use the same method as in 3) to
unknown's avatar
unknown committed
2074 2075 2076
discard ongoing operations.
5) FOREIGN KEY operations: if table->n_foreign_key_checks_running > 0, we
do not allow the discard. We also reserve the data dictionary latch. */
2077 2078 2079 2080 2081 2082 2083 2084 2085

	static const char discard_tablespace_proc1[] =
	"PROCEDURE DISCARD_TABLESPACE_PROC () IS\n"
	"old_id CHAR;\n"
	"new_id CHAR;\n"
	"new_id_low INT;\n"
	"new_id_high INT;\n"
	"table_name CHAR;\n"
	"BEGIN\n"
2086
	"table_name := '";
2087
	static const char discard_tablespace_proc2[] =
2088
	"';\n"
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
	"new_id_high := %lu;\n"
	"new_id_low := %lu;\n"
   "new_id := CONCAT(TO_BINARY(new_id_high, 4), TO_BINARY(new_id_low, 4));\n"
	"SELECT ID INTO old_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = table_name;\n"
	"IF (SQL %% NOTFOUND) THEN\n"
	"	COMMIT WORK;\n"
	"	RETURN;\n"
	"END IF;\n"
	"UPDATE SYS_TABLES SET ID = new_id\n"
	"WHERE ID = old_id;\n"
	"UPDATE SYS_COLUMNS SET TABLE_ID = new_id\n"
	"WHERE TABLE_ID = old_id;\n"
	"UPDATE SYS_INDEXES SET TABLE_ID = new_id\n"
	"WHERE TABLE_ID = old_id;\n"
	"COMMIT WORK;\n"
	"END;\n";
unknown's avatar
unknown committed
2107 2108 2109

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

unknown's avatar
unknown committed
2110
	trx->op_info = "discarding tablespace";
unknown's avatar
unknown committed
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125
	trx_start_if_not_started(trx);

	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	row_mysql_lock_data_dictionary(trx);

	table = dict_table_get_low(name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;

		goto funct_exit;
	}

2126 2127
	if (table->space == 0) {
		ut_print_timestamp(stderr);
2128
		fputs("  InnoDB: Error: table ", stderr);
2129
		ut_print_name(stderr, trx, name);
2130 2131
		fputs("\n"
"InnoDB: is in the system tablespace 0 which cannot be discarded\n", stderr);
2132 2133 2134 2135 2136
		err = DB_ERROR;

		goto funct_exit;
	}

unknown's avatar
unknown committed
2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
	if (table->n_foreign_key_checks_running > 0) {

	        ut_print_timestamp(stderr);
		fputs("	 InnoDB: You are trying to DISCARD table ", stderr);
		ut_print_name(stderr, trx, table->name);
		fputs("\n"
		 "InnoDB: though there is a foreign key check running on it.\n"
		 "InnoDB: Cannot discard the table.\n",
			stderr);

		err = DB_ERROR;

		goto funct_exit;
	}

	/* Check if the table is referenced by foreign key constraints from
	some other table (not the table itself) */

	foreign = UT_LIST_GET_FIRST(table->referenced_list);
	
	while (foreign && foreign->foreign_table == table) {
		foreign = UT_LIST_GET_NEXT(referenced_list, foreign);
	}

	if (foreign && trx->check_foreigns) {

		FILE*	ef	= dict_foreign_err_file;

		/* We only allow discarding a referenced table if
		FOREIGN_KEY_CHECKS is set to 0 */

		err = DB_CANNOT_DROP_CONSTRAINT;

		mutex_enter(&dict_foreign_err_mutex);
		rewind(ef);
		ut_print_timestamp(ef);

unknown's avatar
unknown committed
2174
		fputs("  Cannot DISCARD table ", ef);
unknown's avatar
unknown committed
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
		ut_print_name(ef, trx, name);
		fputs("\n"
			"because it is referenced by ", ef);
		ut_print_name(ef, trx, foreign->foreign_table_name);
		putc('\n', ef);
		mutex_exit(&dict_foreign_err_mutex);

		goto funct_exit;
	}

unknown's avatar
unknown committed
2185 2186
	new_id = dict_hdr_get_new_id(DICT_HDR_TABLE_ID);

2187 2188 2189
	buf = mem_alloc((sizeof discard_tablespace_proc1) +
			(sizeof discard_tablespace_proc2) +
			20 + ut_strlenq(name, '\''));
unknown's avatar
unknown committed
2190

2191 2192 2193 2194 2195 2196
	memcpy(buf, discard_tablespace_proc1, sizeof discard_tablespace_proc1);
	sprintf(ut_strcpyq(buf + (sizeof discard_tablespace_proc1 - 1),
			'\'', name),
		discard_tablespace_proc2,
		(ulong) ut_dulint_get_high(new_id),
		(ulong) ut_dulint_get_low(new_id));
unknown's avatar
unknown committed
2197 2198 2199 2200 2201

	graph = pars_sql(buf);

	ut_a(graph);

unknown's avatar
unknown committed
2202 2203 2204 2205
	/* Remove any locks there are on the table or its records */
	
	lock_reset_all_on_table(table);

unknown's avatar
unknown committed
2206 2207 2208 2209 2210
	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

unknown's avatar
unknown committed
2211
	ut_a(thr = que_fork_start_command(graph));
unknown's avatar
unknown committed
2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239

	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		trx->error_state = DB_SUCCESS;
		trx_general_rollback_for_mysql(trx, FALSE, NULL);
		trx->error_state = DB_SUCCESS;
	} else {
		dict_table_change_id_in_cache(table, new_id);

		success = fil_discard_tablespace(table->space);

		if (!success) {
			trx->error_state = DB_SUCCESS;
			trx_general_rollback_for_mysql(trx, FALSE, NULL);
			trx->error_state = DB_SUCCESS;

			err = DB_ERROR;
		} else {
			/* Set the flag which tells that now it is legal to
			IMPORT a tablespace for this table */
			table->tablespace_discarded = TRUE;
			table->ibd_file_missing = TRUE;
		}
	}
funct_exit:	
unknown's avatar
unknown committed
2240 2241
  	trx_commit_for_mysql(trx);

unknown's avatar
unknown committed
2242 2243 2244 2245 2246 2247
	row_mysql_unlock_data_dictionary(trx);

	if (graph) {
		que_graph_free(graph);
	}

unknown's avatar
unknown committed
2248
	trx->op_info = "";
unknown's avatar
unknown committed
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259

	return((int) err);
}

/*********************************************************************
Imports a tablespace. The space id in the .ibd file must match the space id
of the table in the data dictionary. */

int
row_import_tablespace_for_mysql(
/*============================*/
2260 2261 2262
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx)	/* in: transaction handle */
unknown's avatar
unknown committed
2263 2264 2265
{
	dict_table_t*	table;
	ibool		success;
2266
	dulint		current_lsn;
unknown's avatar
unknown committed
2267 2268 2269 2270 2271 2272
	ulint		err		= DB_SUCCESS;

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());

	trx_start_if_not_started(trx);

unknown's avatar
unknown committed
2273
	trx->op_info = "importing tablespace";
unknown's avatar
unknown committed
2274

2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
	current_lsn = log_get_lsn();
	
	/* It is possible, though very improbable, that the lsn's in the
	tablespace to be imported have risen above the current system lsn, if
	a lengthy purge, ibuf merge, or rollback was performed on a backup
	taken with ibbackup. If that is the case, reset page lsn's in the
	file. We assume that mysqld was shut down after it performed these
	cleanup operations on the .ibd file, so that it stamped the latest lsn
	to the FIL_PAGE_FILE_FLUSH_LSN in the first page of the .ibd file.

	TODO: reset also the trx id's in clustered index records and write
	a new space id to each data page. That would allow us to import clean
	.ibd files from another MySQL installation. */

	success = fil_reset_too_high_lsns(name, current_lsn);

	if (!success) {
unknown's avatar
unknown committed
2292 2293 2294 2295 2296 2297
		ut_print_timestamp(stderr);
		fputs("  InnoDB: Error: cannot reset lsn's in table ", stderr);
		ut_print_name(stderr, trx, name);
		fputs("\n"
		"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n", stderr);

2298 2299 2300 2301 2302 2303 2304
		err = DB_ERROR;

		row_mysql_lock_data_dictionary(trx);

		goto funct_exit;
	}

unknown's avatar
unknown committed
2305 2306 2307 2308 2309 2310 2311 2312
	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

	row_mysql_lock_data_dictionary(trx);

	table = dict_table_get_low(name);

	if (!table) {
unknown's avatar
unknown committed
2313 2314 2315 2316 2317 2318 2319 2320
		ut_print_timestamp(stderr);
		fputs("  InnoDB: table ", stderr);
		ut_print_name(stderr, trx, name);
		fputs("\n"
"InnoDB: does not exist in the InnoDB data dictionary\n"
"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n",
		stderr);

unknown's avatar
unknown committed
2321 2322 2323 2324 2325
		err = DB_TABLE_NOT_FOUND;

		goto funct_exit;
	}

2326 2327
	if (table->space == 0) {
		ut_print_timestamp(stderr);
2328
		fputs("  InnoDB: Error: table ", stderr);
2329
		ut_print_name(stderr, trx, name);
2330 2331
		fputs("\n"
"InnoDB: is in the system tablespace 0 which cannot be imported\n", stderr);
2332 2333 2334 2335 2336
		err = DB_ERROR;

		goto funct_exit;
	}

unknown's avatar
unknown committed
2337 2338
	if (!table->tablespace_discarded) {
		ut_print_timestamp(stderr);
2339
		fputs(
unknown's avatar
unknown committed
2340
"  InnoDB: Error: you are trying to IMPORT a tablespace\n"
2341
"InnoDB: ", stderr);
2342
		ut_print_name(stderr, trx, name);
2343 2344
		fputs(", though you have not called DISCARD on it yet\n"
"InnoDB: during the lifetime of the mysqld process!\n", stderr);
unknown's avatar
unknown committed
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355

		err = DB_ERROR;

		goto funct_exit;
	}

	/* Play safe and remove all insert buffer entries, though we should
	have removed them already when DISCARD TABLESPACE was called */

	ibuf_delete_for_discarded_space(table->space);

unknown's avatar
unknown committed
2356 2357
	success = fil_open_single_table_tablespace(TRUE, table->space,
								table->name);
unknown's avatar
unknown committed
2358 2359 2360 2361
	if (success) {
		table->ibd_file_missing = FALSE;
		table->tablespace_discarded = FALSE;
	} else {
unknown's avatar
unknown committed
2362 2363 2364
		if (table->ibd_file_missing) {
			ut_print_timestamp(stderr);
			fputs(
unknown's avatar
unknown committed
2365
"  InnoDB: cannot find or open in the database directory the .ibd file of\n"
unknown's avatar
unknown committed
2366 2367 2368 2369 2370 2371 2372
"InnoDB: table ", stderr);
			ut_print_name(stderr, trx, name);
			fputs("\n"
"InnoDB: in ALTER TABLE ... IMPORT TABLESPACE\n",
			stderr);
		}

unknown's avatar
unknown committed
2373 2374 2375 2376 2377 2378
		err = DB_ERROR;
	}

funct_exit:	
  	trx_commit_for_mysql(trx);

unknown's avatar
unknown committed
2379 2380
	row_mysql_unlock_data_dictionary(trx);

unknown's avatar
unknown committed
2381
	trx->op_info = "";
unknown's avatar
unknown committed
2382 2383 2384 2385

	return((int) err);
}

2386
/*************************************************************************
unknown's avatar
unknown committed
2387
Drops a table for MySQL. If the name of the table to be dropped is equal
2388 2389
with one of the predefined magic table names, then this also stops printing
the corresponding monitor output by the master thread. */
2390 2391 2392 2393

int
row_drop_table_for_mysql(
/*=====================*/
2394 2395 2396 2397
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: table name */
	trx_t*		trx,	/* in: transaction handle */
	ibool		drop_db)/* in: TRUE=dropping whole database */
2398
{
unknown's avatar
unknown committed
2399
	dict_foreign_t*	foreign;
2400
	dict_table_t*	table;
unknown's avatar
unknown committed
2401
	ulint		space_id;
2402 2403 2404
	que_thr_t*	thr;
	que_t*		graph;
	ulint		err;
2405
	const char*	table_name;
2406
	ulint		namelen;
unknown's avatar
unknown committed
2407
	char*		dir_path_of_temp_table	= NULL;
unknown's avatar
unknown committed
2408
	ibool		success;
unknown's avatar
unknown committed
2409
	ibool		locked_dictionary	= FALSE;
2410 2411
	char*		quoted_name;
	char*		sql;
unknown's avatar
unknown committed
2412

2413 2414 2415 2416
	/* We use the private SQL parser of Innobase to generate the
	query graphs needed in deleting the dictionary data from system
	tables in Innobase. Deleting a row from SYS_INDEXES table also
	frees the file segments of the B-tree associated with the index. */
unknown's avatar
unknown committed
2417

2418
	static const char str1[] =
2419
	"PROCEDURE DROP_TABLE_PROC () IS\n"
2420 2421
	"table_name CHAR;\n"
	"sys_foreign_id CHAR;\n"
2422 2423
	"table_id CHAR;\n"
	"index_id CHAR;\n"
2424
	"foreign_id CHAR;\n"
2425 2426
	"found INT;\n"
	"BEGIN\n"
2427 2428 2429
	"table_name := ";
	static const char str2[] =
	";\n"
2430 2431 2432
	"SELECT ID INTO table_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = table_name;\n"
2433 2434 2435 2436 2437
	"IF (SQL % NOTFOUND) THEN\n"
	"	COMMIT WORK;\n"
	"	RETURN;\n"
	"END IF;\n"
	"found := 1;\n"
2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
	"SELECT ID INTO sys_foreign_id\n"
	"FROM SYS_TABLES\n"
	"WHERE NAME = 'SYS_FOREIGN';\n"
	"IF (SQL % NOTFOUND) THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"IF (table_name = 'SYS_FOREIGN') THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"IF (table_name = 'SYS_FOREIGN_COLS') THEN\n"
	"	found := 0;\n"
	"END IF;\n"
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO foreign_id\n"
	"	FROM SYS_FOREIGN\n"
2453 2454
	"	WHERE FOR_NAME = table_name\n"
        "             AND TO_BINARY(FOR_NAME) = TO_BINARY(table_name);\n"
2455 2456 2457 2458 2459 2460 2461 2462
	"	IF (SQL % NOTFOUND) THEN\n"
	"		found := 0;\n"
	"	ELSE"
	"		DELETE FROM SYS_FOREIGN_COLS WHERE ID = foreign_id;\n"
	"		DELETE FROM SYS_FOREIGN WHERE ID = foreign_id;\n"
	"	END IF;\n"
	"END LOOP;\n"
	"found := 1;\n"
2463 2464 2465 2466 2467 2468 2469 2470
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO index_id\n"
	"	FROM SYS_INDEXES\n"
	"	WHERE TABLE_ID = table_id;\n"	
	"	IF (SQL % NOTFOUND) THEN\n"
	"		found := 0;\n"
	"	ELSE"
	"		DELETE FROM SYS_FIELDS WHERE INDEX_ID = index_id;\n"
unknown's avatar
unknown committed
2471 2472
	"		DELETE FROM SYS_INDEXES WHERE ID = index_id\n"
	"					 AND TABLE_ID = table_id;\n"
2473 2474 2475 2476 2477 2478 2479
	"	END IF;\n"
	"END LOOP;\n"
	"DELETE FROM SYS_COLUMNS WHERE TABLE_ID = table_id;\n"
	"DELETE FROM SYS_TABLES WHERE ID = table_id;\n"
	"COMMIT WORK;\n"
	"END;\n";

2480 2481 2482 2483 2484 2485 2486 2487 2488
	ut_a(name != NULL);

	if (srv_created_new_raw) {
		fputs(
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
		"InnoDB: with raw, and innodb_force_... is removed.\n",
unknown's avatar
unknown committed
2489
                stderr);
2490 2491 2492 2493

		return(DB_ERROR);
	}

unknown's avatar
unknown committed
2494
	trx->op_info = "dropping table";
2495 2496

	trx_start_if_not_started(trx);
2497

2498 2499 2500 2501 2502 2503 2504 2505
	/* The table name is prefixed with the database name and a '/'.
	Certain table names starting with 'innodb_' have their special
	meaning regardless of the database name.  Thus, we need to
	ignore the database name prefix in the comparisons. */
	table_name = strchr(name, '/');
	ut_a(table_name);
	table_name++;
	namelen = strlen(table_name) + 1;
2506

2507
	if (namelen == sizeof S_innodb_monitor
2508
			&& !memcmp(table_name, S_innodb_monitor,
2509
				sizeof S_innodb_monitor)) {
2510

2511 2512 2513 2514 2515 2516
		/* Table name equals "innodb_monitor":
		stop monitor prints */
 				
		srv_print_innodb_monitor = FALSE;
		srv_print_innodb_lock_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_lock_monitor
2517
			&& !memcmp(table_name, S_innodb_lock_monitor,
2518 2519 2520 2521
				sizeof S_innodb_lock_monitor)) {
		srv_print_innodb_monitor = FALSE;
		srv_print_innodb_lock_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_tablespace_monitor
2522
			&& !memcmp(table_name, S_innodb_tablespace_monitor,
2523
				sizeof S_innodb_tablespace_monitor)) {
2524

2525 2526
		srv_print_innodb_tablespace_monitor = FALSE;
	} else if (namelen == sizeof S_innodb_table_monitor
2527
			&& !memcmp(table_name, S_innodb_table_monitor,
2528
				sizeof S_innodb_table_monitor)) {
2529

2530 2531 2532 2533 2534 2535 2536 2537 2538
		srv_print_innodb_table_monitor = FALSE;
	}

	quoted_name = mem_strdupq(name, '\'');
	namelen = strlen(quoted_name);
	sql = mem_alloc((sizeof str1) + (sizeof str2) - 2 + 1 + namelen);
	memcpy(sql, str1, (sizeof str1) - 1);
	memcpy(sql + (sizeof str1) - 1, quoted_name, namelen);
	memcpy(sql + (sizeof str1) - 1 + namelen, str2, sizeof str2);
2539
	mem_free(quoted_name);
unknown's avatar
unknown committed
2540

2541 2542 2543
	/* Serialize data dictionary operations with dictionary mutex:
	no deadlocks can occur then in these operations */

unknown's avatar
unknown committed
2544
	if (trx->dict_operation_lock_mode != RW_X_LATCH) {
unknown's avatar
unknown committed
2545 2546
		/* Prevent foreign key checks etc. while we are dropping the
		table */
unknown's avatar
unknown committed
2547

unknown's avatar
unknown committed
2548 2549 2550
		row_mysql_lock_data_dictionary(trx);

		locked_dictionary = TRUE;
2551 2552
	}

2553
#ifdef UNIV_SYNC_DEBUG
unknown's avatar
unknown committed
2554 2555
	ut_ad(mutex_own(&(dict_sys->mutex)));
	ut_ad(rw_lock_own(&dict_operation_lock, RW_LOCK_EX));
2556
#endif /* UNIV_SYNC_DEBUG */
unknown's avatar
unknown committed
2557
	
2558
	graph = pars_sql(sql);
2559 2560

	ut_a(graph);
2561
	mem_free(sql);
2562 2563 2564 2565 2566 2567 2568 2569 2570 2571

	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

	table = dict_table_get_low(name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;
unknown's avatar
unknown committed
2572
	    	ut_print_timestamp(stderr);
2573

2574
		fputs("  InnoDB: Error: table ", stderr);
2575
		ut_print_name(stderr, trx, name);
2576
		fputs(" does not exist in the InnoDB internal\n"
2577 2578
     	"InnoDB: data dictionary though MySQL is trying to drop it.\n"
     	"InnoDB: Have you copied the .frm file of the table to the\n"
unknown's avatar
unknown committed
2579
	"InnoDB: MySQL database directory from another database?\n"
2580 2581 2582
	"InnoDB: You can look for further help from\n"
	"InnoDB: http://dev.mysql.com/doc/mysql/en/"
	"InnoDB_troubleshooting_datadict.html\n", stderr);
2583 2584 2585
		goto funct_exit;
	}

unknown's avatar
unknown committed
2586 2587 2588
	/* Check if the table is referenced by foreign key constraints from
	some other table (not the table itself) */

unknown's avatar
unknown committed
2589 2590
	foreign = UT_LIST_GET_FIRST(table->referenced_list);
	
unknown's avatar
unknown committed
2591
	while (foreign && foreign->foreign_table == table) {
2592
	check_next_foreign:
unknown's avatar
unknown committed
2593 2594 2595
		foreign = UT_LIST_GET_NEXT(referenced_list, foreign);
	}

2596 2597 2598
	if (foreign && trx->check_foreigns &&
		!(drop_db && dict_tables_have_same_db(
			name, foreign->foreign_table_name))) {
2599
		FILE*	ef	= dict_foreign_err_file;
unknown's avatar
unknown committed
2600 2601 2602 2603 2604 2605 2606

		/* We only allow dropping a referenced table if
		FOREIGN_KEY_CHECKS is set to 0 */

		err = DB_CANNOT_DROP_CONSTRAINT;

		mutex_enter(&dict_foreign_err_mutex);
2607 2608 2609 2610
		rewind(ef);
		ut_print_timestamp(ef);

		fputs("  Cannot drop table ", ef);
2611
		ut_print_name(ef, trx, name);
2612 2613
		fputs("\n"
			"because it is referenced by ", ef);
2614
		ut_print_name(ef, trx, foreign->foreign_table_name);
2615
		putc('\n', ef);
unknown's avatar
unknown committed
2616 2617 2618 2619 2620
		mutex_exit(&dict_foreign_err_mutex);

		goto funct_exit;
	}

2621 2622 2623 2624
	if (foreign && trx->check_foreigns) {
		goto check_next_foreign;
	}

unknown's avatar
unknown committed
2625
	if (table->n_mysql_handles_opened > 0) {
unknown's avatar
unknown committed
2626
		ibool	added;
2627

unknown's avatar
unknown committed
2628
		added = row_add_table_to_background_drop_list(table);
2629

unknown's avatar
unknown committed
2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640
	        if (added) {
			ut_print_timestamp(stderr);
fputs("	 InnoDB: Warning: MySQL is trying to drop table ", stderr);
			ut_print_name(stderr, trx, table->name);
			fputs("\n"
"InnoDB: though there are still open handles to it.\n"
"InnoDB: Adding the table to the background drop queue.\n",
			stderr);
			
			/* We return DB_SUCCESS to MySQL though the drop will
			happen lazily later */
unknown's avatar
unknown committed
2641

unknown's avatar
unknown committed
2642 2643 2644 2645 2646
			err = DB_SUCCESS;
		} else {
			/* The table is already in the background drop list */
			err = DB_ERROR;
		}
unknown's avatar
unknown committed
2647

unknown's avatar
unknown committed
2648
		goto funct_exit;
unknown's avatar
unknown committed
2649
	}
2650

unknown's avatar
unknown committed
2651 2652 2653 2654 2655 2656
	/* TODO: could we replace the counter n_foreign_key_checks_running
	with lock checks on the table? Acquire here an exclusive lock on the
	table, and rewrite lock0lock.c and the lock wait in srv0srv.c so that
	they can cope with the table having been dropped here? Foreign key
	checks take an IS or IX lock on the table. */

unknown's avatar
unknown committed
2657
	if (table->n_foreign_key_checks_running > 0) {
2658

unknown's avatar
unknown committed
2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669
		ibool	added;

		added = row_add_table_to_background_drop_list(table);

		if (added) {
	        	ut_print_timestamp(stderr);
fputs("	 InnoDB: You are trying to drop table ", stderr);
			ut_print_name(stderr, trx, table->name);
			fputs("\n"
"InnoDB: though there is a foreign key check running on it.\n"
"InnoDB: Adding the table to the background drop queue.\n",
2670
			stderr);
unknown's avatar
unknown committed
2671

unknown's avatar
unknown committed
2672 2673
			/* We return DB_SUCCESS to MySQL though the drop will
			happen lazily later */
unknown's avatar
unknown committed
2674

unknown's avatar
unknown committed
2675 2676 2677 2678 2679
			err = DB_SUCCESS;
		} else {
			/* The table is already in the background drop list */
			err = DB_ERROR;
		}
unknown's avatar
unknown committed
2680 2681 2682 2683

		goto funct_exit;
	}
	
unknown's avatar
unknown committed
2684 2685 2686 2687
	/* Remove any locks there are on the table or its records */
	
	lock_reset_all_on_table(table);

2688 2689 2690
	trx->dict_operation = TRUE;
	trx->table_id = table->id;

unknown's avatar
unknown committed
2691
	ut_a(thr = que_fork_start_command(graph));
2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703

	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
		ut_a(err == DB_OUT_OF_FILE_SPACE);

		err = DB_MUST_GET_MORE_FILE_SPACE;
		
		row_mysql_handle_errors(&err, trx, thr, NULL);

2704
		ut_error;
2705
	} else {
unknown's avatar
unknown committed
2706 2707 2708
		ibool		is_path;
		const char*	name_or_path;

unknown's avatar
unknown committed
2709
		space_id = table->space;
unknown's avatar
unknown committed
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
		
		if (table->dir_path_of_temp_table != NULL) {
			dir_path_of_temp_table =
				mem_strdup(table->dir_path_of_temp_table);
			is_path = TRUE;
			name_or_path = dir_path_of_temp_table;
		} else {
			is_path = FALSE;
			name_or_path = name;
		}

2721
		dict_table_remove_from_cache(table);
unknown's avatar
unknown committed
2722 2723 2724

		if (dict_load_table(name) != NULL) {
			ut_print_timestamp(stderr);
unknown's avatar
unknown committed
2725
			fputs("  InnoDB: Error: not able to remove table ",
2726
				stderr);
2727
			ut_print_name(stderr, trx, name);
unknown's avatar
unknown committed
2728
			fputs(" from the dictionary cache!\n", stderr);
unknown's avatar
unknown committed
2729 2730 2731 2732 2733 2734
			err = DB_ERROR;
		}

		/* Do not drop possible .ibd tablespace if something went
		wrong: we do not want to delete valuable data of the user */

unknown's avatar
unknown committed
2735
		if (err == DB_SUCCESS && space_id > 0) {
unknown's avatar
unknown committed
2736 2737 2738
			if (!fil_space_for_table_exists_in_mem(space_id,
								name_or_path,
								is_path,
unknown's avatar
unknown committed
2739
								FALSE, TRUE)) {
unknown's avatar
unknown committed
2740 2741 2742 2743 2744 2745 2746
				err = DB_SUCCESS;

				fprintf(stderr,
"InnoDB: We removed now the InnoDB internal data dictionary entry\n"
"InnoDB: of table ");	
				ut_print_name(stderr, trx, name);
				fprintf(stderr, ".\n");
unknown's avatar
unknown committed
2747 2748 2749

				goto funct_exit;
			}
unknown's avatar
unknown committed
2750

unknown's avatar
unknown committed
2751 2752 2753
			success = fil_delete_tablespace(space_id);

			if (!success) {
unknown's avatar
unknown committed
2754 2755 2756 2757 2758 2759
				fprintf(stderr,
"InnoDB: We removed now the InnoDB internal data dictionary entry\n"
"InnoDB: of table ");	
				ut_print_name(stderr, trx, name);
				fprintf(stderr, ".\n");

unknown's avatar
unknown committed
2760 2761
				ut_print_timestamp(stderr);
				fprintf(stderr,
2762 2763
"  InnoDB: Error: not able to delete tablespace %lu of table ",
					(ulong) space_id);
2764
				ut_print_name(stderr, trx, name);
2765
				fputs("!\n", stderr);
unknown's avatar
unknown committed
2766 2767
				err = DB_ERROR;
			}
unknown's avatar
unknown committed
2768
		}
2769
	}
unknown's avatar
unknown committed
2770
funct_exit:
2771

unknown's avatar
unknown committed
2772 2773
  	trx_commit_for_mysql(trx);

unknown's avatar
unknown committed
2774 2775
	if (locked_dictionary) {
		row_mysql_unlock_data_dictionary(trx);	
2776 2777
	}

unknown's avatar
unknown committed
2778 2779 2780 2781
	if (dir_path_of_temp_table) {
		mem_free(dir_path_of_temp_table);
	}

2782 2783
	que_graph_free(graph);
	
unknown's avatar
unknown committed
2784
	trx->op_info = "";
2785

unknown's avatar
unknown committed
2786 2787
	srv_wake_master_thread();

2788 2789 2790
	return((int) err);
}

2791 2792 2793 2794 2795 2796
/*************************************************************************
Drops a database for MySQL. */

int
row_drop_database_for_mysql(
/*========================*/
2797 2798 2799
				/* out: error code or DB_SUCCESS */
	const char*	name,	/* in: database name which ends to '/' */
	trx_t*		trx)	/* in: transaction handle */
2800
{
unknown's avatar
unknown committed
2801
        dict_table_t* table;
2802 2803
	char*	table_name;
	int	err	= DB_SUCCESS;
2804
	ulint	namelen	= strlen(name);
2805 2806 2807
	
	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	ut_a(name != NULL);
2808
	ut_a(name[namelen - 1] == '/');
2809
	
unknown's avatar
unknown committed
2810
	trx->op_info = "dropping database";
2811
	
unknown's avatar
Merge  
unknown committed
2812
	trx_start_if_not_started(trx);
unknown's avatar
unknown committed
2813
loop:
unknown's avatar
unknown committed
2814
	row_mysql_lock_data_dictionary(trx);
2815

unknown's avatar
unknown committed
2816
	while ((table_name = dict_get_first_table_name_in_db(name))) {
2817
		ut_a(memcmp(table_name, name, namelen) == 0);
2818

unknown's avatar
unknown committed
2819 2820 2821 2822 2823 2824 2825 2826
		table = dict_table_get_low(table_name);

		ut_a(table);

		/* Wait until MySQL does not have any queries running on
		the table */

		if (table->n_mysql_handles_opened > 0) {
unknown's avatar
unknown committed
2827
			row_mysql_unlock_data_dictionary(trx);
unknown's avatar
unknown committed
2828

unknown's avatar
unknown committed
2829
			ut_print_timestamp(stderr);
2830 2831
			fputs(
	"  InnoDB: Warning: MySQL is trying to drop database ", stderr);
2832
			ut_print_name(stderr, trx, name);
2833 2834
			fputs("\n"
	"InnoDB: though there are still open handles to table ", stderr);
2835
			ut_print_name(stderr, trx, table_name);
2836
			fputs(".\n", stderr);
unknown's avatar
unknown committed
2837 2838 2839 2840

		        os_thread_sleep(1000000);

		        mem_free(table_name);
unknown's avatar
unknown committed
2841 2842 2843 2844

		        goto loop;
		}

2845
		err = row_drop_table_for_mysql(table_name, trx, TRUE);
2846 2847 2848 2849

		mem_free(table_name);

		if (err != DB_SUCCESS) {
2850
			fputs("InnoDB: DROP DATABASE ", stderr);
2851
			ut_print_name(stderr, trx, name);
2852 2853
			fprintf(stderr, " failed with error %lu for table ",
				(ulint) err);
2854
			ut_print_name(stderr, trx, table_name);
2855
			putc('\n', stderr);
2856 2857 2858 2859
			break;
		}
	}

2860 2861
	trx_commit_for_mysql(trx);

unknown's avatar
unknown committed
2862 2863
	row_mysql_unlock_data_dictionary(trx);
	
unknown's avatar
unknown committed
2864
	trx->op_info = "";
2865 2866 2867 2868

	return(err);
}

unknown's avatar
unknown committed
2869 2870 2871 2872 2873 2874 2875
/*************************************************************************
Checks if a table name contains the string "/#sql" which denotes temporary
tables in MySQL. */
static
ibool
row_is_mysql_tmp_table_name(
/*========================*/
2876 2877 2878
				/* out: TRUE if temporary table */
	const char*	name)	/* in: table name in the form
				'database/tablename' */
unknown's avatar
unknown committed
2879
{
2880
	return(strstr(name, "/#sql") != NULL);
unknown's avatar
unknown committed
2881 2882
}

2883 2884 2885 2886 2887 2888
/*************************************************************************
Renames a table for MySQL. */

int
row_rename_table_for_mysql(
/*=======================*/
2889 2890 2891 2892
					/* out: error code or DB_SUCCESS */
	const char*	old_name,	/* in: old table name */
	const char*	new_name,	/* in: new table name */
	trx_t*		trx)		/* in: transaction handle */
2893 2894 2895
{
	dict_table_t*	table;
	que_thr_t*	thr;
unknown's avatar
unknown committed
2896
	que_t*		graph			= NULL;
2897
	ulint		err;
2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937
	/* We use the private SQL parser of Innobase to generate the
	query graphs needed in deleting the dictionary data from system
	tables in Innobase. Deleting a row from SYS_INDEXES table also
	frees the file segments of the B-tree associated with the index. */
	static const char str1[] =
	"PROCEDURE RENAME_TABLE_PROC () IS\n"
	"new_table_name CHAR;\n"
	"old_table_name CHAR;\n"
	"gen_constr_prefix CHAR;\n"
	"new_db_name CHAR;\n"
	"foreign_id CHAR;\n"
	"new_foreign_id CHAR;\n"
	"old_db_name_len INT;\n"
	"old_t_name_len INT;\n"
	"new_db_name_len INT;\n"
	"id_len INT;\n"
	"found INT;\n"
	"BEGIN\n"
	"new_table_name := '";
	static const char str2[] =
	"';\nold_table_name := '";
	static const char str3[] =
	"';\n"
	"UPDATE SYS_TABLES SET NAME = new_table_name\n"
	"WHERE NAME = old_table_name;\n";
	static const char str4a1[] = /* drop some constraints of tmp tables */
	"DELETE FROM SYS_FOREIGN_COLS WHERE ID = '";
	static const char str4a2[] = "';\n"
	"DELETE FROM SYS_FOREIGN WHERE ID = '";
	static const char str4a3[] = "';\n";
	static const char str4b[] = /* rename all constraints */
	"found := 1;\n"
	"old_db_name_len := INSTR(old_table_name, '/') - 1;\n"
	"new_db_name_len := INSTR(new_table_name, '/') - 1;\n"
	"new_db_name := SUBSTR(new_table_name, 0, new_db_name_len);\n"
	"old_t_name_len := LENGTH(old_table_name);\n"
	"gen_constr_prefix := CONCAT(old_table_name, '_ibfk_');\n"
	"WHILE found = 1 LOOP\n"
	"	SELECT ID INTO foreign_id\n"
	"	FROM SYS_FOREIGN\n"
2938 2939
	"	WHERE FOR_NAME = old_table_name\n"
	"	      AND TO_BINARY(FOR_NAME) = TO_BINARY(old_table_name);\n"
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
	"	IF (SQL % NOTFOUND) THEN\n"
	"	 found := 0;\n"
	"	ELSE\n"
	"	 UPDATE SYS_FOREIGN\n"
	"	 SET FOR_NAME = new_table_name\n"
	"	 WHERE ID = foreign_id;\n"
	"	 id_len := LENGTH(foreign_id);\n"
	"	 IF (INSTR(foreign_id, '/') > 0) THEN\n"
	"	 	IF (INSTR(foreign_id,\n"
	"				gen_constr_prefix) > 0)\n"
	"		THEN\n"
	"		  new_foreign_id :=\n"
	"		    CONCAT(new_table_name,\n"
	"			SUBSTR(foreign_id, old_t_name_len,\n"
	"			      	 id_len - old_t_name_len));\n"
	"		ELSE\n"
	"		  new_foreign_id :=\n"
	"		    CONCAT(new_db_name,\n"
	"			SUBSTR(foreign_id,\n"
	"				old_db_name_len,\n"
	"				 id_len - old_db_name_len));\n"
	"		END IF;\n"
	"		UPDATE SYS_FOREIGN\n"
	"		SET ID = new_foreign_id\n"
	"		WHERE ID = foreign_id;\n"
	"		UPDATE SYS_FOREIGN_COLS\n"
	"		SET ID = new_foreign_id\n"
	"		WHERE ID = foreign_id;\n"
	"	 END IF;\n"
	"	END IF;\n"
	"END LOOP;\n"
	"UPDATE SYS_FOREIGN SET REF_NAME = new_table_name\n"
2972 2973
	"WHERE REF_NAME = old_table_name\n"
	"      AND TO_BINARY(REF_NAME) = TO_BINARY(old_table_name);\n";
2974 2975 2976
	static const char str5[] =
	"END;\n";

unknown's avatar
unknown committed
2977
	mem_heap_t*	heap			= NULL;
2978
	const char**	constraints_to_drop	= NULL;
unknown's avatar
unknown committed
2979
	ulint		n_constraints_to_drop	= 0;
2980 2981
	ibool           recovering_temp_table   = FALSE;
	ibool		old_is_tmp, new_is_tmp;
2982
	ulint		len;
unknown's avatar
unknown committed
2983
	ulint		i;
unknown's avatar
unknown committed
2984
        ibool		success;
2985 2986 2987 2988
	/* length of database name; 0 if not renaming to a temporary table */
	ulint		db_name_len;
	char*		sql;
	char*		sqlend;
2989 2990 2991 2992 2993

	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
	ut_a(old_name != NULL);
	ut_a(new_name != NULL);

2994
	if (srv_created_new_raw || srv_force_recovery) {
2995
		fputs(
2996 2997 2998 2999
		"InnoDB: A new raw disk partition was initialized or\n"
		"InnoDB: innodb_force_recovery is on: we do not allow\n"
		"InnoDB: database modifications by the user. Shut down\n"
		"InnoDB: mysqld and edit my.cnf so that newraw is replaced\n"
3000 3001
		"InnoDB: with raw, and innodb_force_... is removed.\n",
		stderr);
3002

unknown's avatar
unknown committed
3003 3004 3005
  		trx_commit_for_mysql(trx);
		return(DB_ERROR);
	}
unknown's avatar
unknown committed
3006
	
3007
	if (row_mysql_is_system_table(new_name)) {
unknown's avatar
unknown committed
3008 3009 3010 3011 3012 3013 3014
	    	
		fprintf(stderr,
    "InnoDB: Error: trying to create a MySQL system table %s of type InnoDB.\n"
    "InnoDB: MySQL system tables must be of the MyISAM type!\n",
		new_name);

  		trx_commit_for_mysql(trx);
3015 3016 3017
		return(DB_ERROR);
	}

unknown's avatar
unknown committed
3018
	trx->op_info = "renaming table";
unknown's avatar
Merge  
unknown committed
3019
	trx_start_if_not_started(trx);
3020

3021 3022 3023
	old_is_tmp = row_is_mysql_tmp_table_name(old_name);
	new_is_tmp = row_is_mysql_tmp_table_name(new_name);
	
3024
	if (row_mysql_is_recovered_tmp_table(new_name)) {
unknown's avatar
unknown committed
3025

unknown's avatar
unknown committed
3026
                recovering_temp_table = TRUE;
3027 3028 3029
        } else {
		/* Serialize data dictionary operations with dictionary mutex:
		no deadlocks can occur then in these operations */
unknown's avatar
unknown committed
3030 3031 3032

		row_mysql_lock_data_dictionary(trx);
	}
unknown's avatar
unknown committed
3033 3034 3035 3036 3037

	table = dict_table_get_low(old_name);

	if (!table) {
		err = DB_TABLE_NOT_FOUND;
unknown's avatar
unknown committed
3038 3039
	    	ut_print_timestamp(stderr);

3040
                fputs("  InnoDB: Error: table ", stderr);
3041
                ut_print_name(stderr, trx, old_name);
3042
                fputs(" does not exist in the InnoDB internal\n"
unknown's avatar
unknown committed
3043 3044 3045 3046
     	"InnoDB: data dictionary though MySQL is trying to rename the table.\n"
     	"InnoDB: Have you copied the .frm file of the table to the\n"
	"InnoDB: MySQL database directory from another database?\n"
	"InnoDB: You can look for further help from section 15.1 of\n"
3047
        "InnoDB: http://www.innodb.com/ibman.php\n", stderr);
unknown's avatar
unknown committed
3048 3049 3050 3051 3052 3053
		goto funct_exit;
	}

	if (table->ibd_file_missing) {
		err = DB_TABLE_NOT_FOUND;
	    	ut_print_timestamp(stderr);
unknown's avatar
unknown committed
3054

3055
                fputs("  InnoDB: Error: table ", stderr);
3056
                ut_print_name(stderr, trx, old_name);
3057 3058
                fputs(
	" does not have an .ibd file in the database directory.\n"
unknown's avatar
unknown committed
3059
	"InnoDB: You can look for further help from section 15.1 of\n"
3060
        "InnoDB: http://www.innodb.com/ibman.php\n", stderr);
unknown's avatar
unknown committed
3061 3062 3063
		goto funct_exit;
	}

3064 3065 3066
	/* calculate the length of the SQL string */
	len = (sizeof str1) + (sizeof str2) + (sizeof str3) + (sizeof str5) - 4
		+ ut_strlenq(new_name, '\'') + ut_strlenq(old_name, '\'');
3067

3068
	if (new_is_tmp) {
3069
		db_name_len = dict_get_db_name_len(old_name) + 1;
unknown's avatar
unknown committed
3070

unknown's avatar
unknown committed
3071 3072 3073 3074 3075
		/* MySQL is doing an ALTER TABLE command and it renames the
		original table to a temporary table name. We want to preserve
		the original foreign key constraint definitions despite the
		name change. An exception is those constraints for which
		the ALTER TABLE contained DROP FOREIGN KEY <foreign key id>.*/
unknown's avatar
unknown committed
3076

unknown's avatar
unknown committed
3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087
		heap = mem_heap_create(100);
		
		err = dict_foreign_parse_drop_constraints(heap, trx,
					table,
					&n_constraints_to_drop,
					&constraints_to_drop);
		if (err != DB_SUCCESS) {

			goto funct_exit;
		}
		
3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116
		/* reserve space for all database names */
		len += 2 * n_constraints_to_drop
			* (ut_strlenq(old_name, '\'')
			- ut_strlenq(old_name + db_name_len, '\''));

		for (i = 0; i < n_constraints_to_drop; i++) {
			ulint	addlen
				= 2 * ut_strlenq(constraints_to_drop[i], '\'')
				+ ((sizeof str4a1) + (sizeof str4a2)
				+ (sizeof str4a3) - 3);
			if (!strchr(constraints_to_drop[i], '/')) {
				addlen *= 2;
			}
			len += addlen;
		}
	} else {
		db_name_len = 0;
		len += (sizeof str4b) - 1;
	}

	sql = sqlend = mem_alloc(len + 1);
	memcpy(sql, str1, (sizeof str1) - 1);
	sqlend += (sizeof str1) - 1;
	sqlend = ut_strcpyq(sqlend, '\'', new_name);
	memcpy(sqlend, str2, (sizeof str2) - 1);
	sqlend += (sizeof str2) - 1;
	sqlend = ut_strcpyq(sqlend, '\'', old_name);
	memcpy(sqlend, str3, (sizeof str3) - 1);
	sqlend += (sizeof str3) - 1;
unknown's avatar
unknown committed
3117

3118
	if (db_name_len) {
unknown's avatar
unknown committed
3119 3120 3121 3122
		/* Internally, old format < 4.0.18 constraints have as the
		constraint id <number>_<number>, while new format constraints
		have <databasename>/<constraintname>. */

unknown's avatar
unknown committed
3123
		for (i = 0; i < n_constraints_to_drop; i++) {
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137
			memcpy(sqlend, str4a1, (sizeof str4a1) - 1);
			sqlend += (sizeof str4a1) - 1;
			sqlend = ut_memcpyq(sqlend, '\'',
				old_name, db_name_len);
			sqlend = ut_strcpyq(sqlend, '\'',
				constraints_to_drop[i]);
			memcpy(sqlend, str4a2, (sizeof str4a2) - 1);
			sqlend += (sizeof str4a2) - 1;
			sqlend = ut_memcpyq(sqlend, '\'',
				old_name, db_name_len);
                        sqlend = ut_strcpyq(sqlend, '\'',
				constraints_to_drop[i]);
			memcpy(sqlend, str4a3, (sizeof str4a3) - 1);
			sqlend += (sizeof str4a3) - 1;
unknown's avatar
unknown committed
3138

3139
			if (!strchr(constraints_to_drop[i], '/')) {
unknown's avatar
unknown committed
3140 3141 3142 3143 3144
				/* If this happens to be an old format
				constraint, let us delete it. Since all new
				format constraints contain '/', it does no
				harm to run these DELETEs anyway. */

3145 3146 3147 3148 3149 3150 3151 3152 3153 3154
				memcpy(sqlend, str4a1, (sizeof str4a1) - 1);
				sqlend += (sizeof str4a1) - 1;
				sqlend = ut_strcpyq(sqlend, '\'',
					constraints_to_drop[i]);
				memcpy(sqlend, str4a2, (sizeof str4a2) - 1);
				sqlend += (sizeof str4a2) - 1;
                        	sqlend = ut_strcpyq(sqlend, '\'',
					constraints_to_drop[i]);
				memcpy(sqlend, str4a3, (sizeof str4a3) - 1);
				sqlend += (sizeof str4a3) - 1;
unknown's avatar
unknown committed
3155
			}
unknown's avatar
unknown committed
3156
		}
3157 3158 3159 3160 3161
	}
	else {
		memcpy(sqlend, str4b, (sizeof str4b) - 1);
		sqlend += (sizeof str4b) - 1;
	}
unknown's avatar
unknown committed
3162

3163 3164
	memcpy(sqlend, str5, sizeof str5);
	sqlend += sizeof str5;
unknown's avatar
unknown committed
3165

3166
	ut_a(sqlend == sql + len + 1);
3167
	
3168
	graph = pars_sql(sql);
3169 3170

	ut_a(graph);
3171
	mem_free(sql);
3172 3173 3174 3175 3176 3177

	graph->trx = trx;
	trx->graph = NULL;

	graph->fork_type = QUE_FORK_MYSQL_INTERFACE;

unknown's avatar
unknown committed
3178
	ut_a(thr = que_fork_start_command(graph));
3179 3180 3181 3182 3183 3184

	que_run_threads(thr);

	err = trx->error_state;

	if (err != DB_SUCCESS) {
unknown's avatar
unknown committed
3185 3186
		if (err == DB_DUPLICATE_KEY) {
	    		ut_print_timestamp(stderr);
3187 3188 3189 3190 3191
			fputs(
     "  InnoDB: Error; possible reasons:\n"
     "InnoDB: 1) Table rename would cause two FOREIGN KEY constraints\n"
     "InnoDB: to have the same internal name in case-insensitive comparison.\n"
     "InnoDB: 2) table ", stderr);
3192
                ut_print_name(stderr, trx, new_name);
3193 3194
                fputs(" exists in the InnoDB internal data\n"
     "InnoDB: dictionary though MySQL is trying rename table ", stderr);
3195
                ut_print_name(stderr, trx, old_name);
3196
		fputs(" to it.\n"
unknown's avatar
unknown committed
3197
     "InnoDB: Have you deleted the .frm file and not used DROP TABLE?\n"
3198 3199 3200
     "InnoDB: You can look for further help from\n"
     "InnoDB: http://dev.mysql.com/doc/mysql/en/"
     "InnoDB_troubleshooting_datadict.html\n"
3201
     "InnoDB: If table ", stderr);
unknown's avatar
unknown committed
3202
			ut_print_name(stderr, trx, new_name);
3203 3204
			fputs(
		" is a temporary table #sql..., then it can be that\n"
unknown's avatar
unknown committed
3205
     "InnoDB: there are still queries running on the table, and it will be\n"
3206
     "InnoDB: dropped automatically when the queries end.\n"
unknown's avatar
unknown committed
3207 3208
     "InnoDB: You can drop the orphaned table inside InnoDB by\n"
     "InnoDB: creating an InnoDB table with the same name in another\n"
unknown's avatar
unknown committed
3209
     "InnoDB: database and copying the .frm file to the current database.\n"
unknown's avatar
unknown committed
3210
     "InnoDB: Then MySQL thinks the table exists, and DROP TABLE will\n"
3211
     "InnoDB: succeed.\n", stderr);
unknown's avatar
unknown committed
3212 3213 3214 3215
		}
		trx->error_state = DB_SUCCESS;
		trx_general_rollback_for_mysql(trx, FALSE, NULL);
		trx->error_state = DB_SUCCESS;
3216
	} else {
unknown's avatar
unknown committed
3217 3218 3219 3220
		/* The following call will also rename the .ibd data file if
		the table is stored in a single-table tablespace */

		success = dict_table_rename_in_cache(table, new_name,
3221
				!new_is_tmp);
unknown's avatar
unknown committed
3222 3223 3224 3225 3226
		if (!success) {
			trx->error_state = DB_SUCCESS;
			trx_general_rollback_for_mysql(trx, FALSE, NULL);
			trx->error_state = DB_SUCCESS;
			ut_print_timestamp(stderr);
3227 3228
			fputs(" InnoDB: Error in table rename, cannot rename ",
				stderr);
3229
			ut_print_name(stderr, trx, old_name);
3230
			fputs(" to ", stderr);
3231
			ut_print_name(stderr, trx, new_name);
3232
			putc('\n', stderr);
unknown's avatar
unknown committed
3233 3234 3235 3236
			err = DB_ERROR;

			goto funct_exit;
		}
unknown's avatar
unknown committed
3237

3238 3239 3240 3241 3242
		/* We only want to switch off some of the type checking in
		an ALTER, not in a RENAME. */
		
		err = dict_load_foreigns(new_name,
			old_is_tmp ? trx->check_foreigns : TRUE);
unknown's avatar
unknown committed
3243

3244 3245
		if (err != DB_SUCCESS) {
			ut_print_timestamp(stderr);
unknown's avatar
unknown committed
3246

3247
			if (old_is_tmp) {
3248 3249
				fputs("  InnoDB: Error: in ALTER TABLE ",
					stderr);
3250
				ut_print_name(stderr, trx, new_name);
3251 3252 3253 3254
				fputs("\n"
	"InnoDB: has or is referenced in foreign key constraints\n"
	"InnoDB: which are not compatible with the new table definition.\n",
					stderr);
3255
			} else {
unknown's avatar
unknown committed
3256 3257 3258
				fputs(
				"  InnoDB: Error: in RENAME TABLE table ",
					stderr);
3259
				ut_print_name(stderr, trx, new_name);
unknown's avatar
unknown committed
3260
				fputs("\n"
3261 3262
	"InnoDB: is referenced in foreign key constraints\n"
	"InnoDB: which are not compatible with the new table definition.\n",
3263
					stderr);
unknown's avatar
unknown committed
3264
			}
3265 3266 3267 3268 3269 3270 3271

			ut_a(dict_table_rename_in_cache(table,
					old_name, FALSE));
			trx->error_state = DB_SUCCESS;
			trx_general_rollback_for_mysql(trx, FALSE,
				NULL);
			trx->error_state = DB_SUCCESS;
unknown's avatar
unknown committed
3272
		}
3273 3274
	}
funct_exit:	
unknown's avatar
unknown committed
3275 3276
  	trx_commit_for_mysql(trx);

unknown's avatar
unknown committed
3277 3278 3279
	if (!recovering_temp_table) {
		row_mysql_unlock_data_dictionary(trx);
	}
3280

unknown's avatar
unknown committed
3281 3282 3283 3284 3285 3286 3287
	if (graph) {
		que_graph_free(graph);
	}

	if (heap) {
		mem_heap_free(heap);
	}
3288
	
unknown's avatar
unknown committed
3289
	trx->op_info = "";
3290

3291 3292
	return((int) err);
}
unknown's avatar
unknown committed
3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316

/*************************************************************************
Checks that the index contains entries in an ascending order, unique
constraint is not broken, and calculates the number of index entries
in the read view of the current transaction. */
static
ibool
row_scan_and_check_index(
/*=====================*/
					/* out: TRUE if ok */
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct in MySQL */
	dict_index_t*	index,		/* in: index */
	ulint*		n_rows)		/* out: number of entries seen in the
					current consistent read */
{
	mem_heap_t*	heap;
	dtuple_t*	prev_entry = NULL;
	ulint		matched_fields;
	ulint		matched_bytes;
	byte*		buf;
	ulint		ret;
	rec_t*		rec;
	ibool		is_ok	= TRUE;
	int		cmp;
unknown's avatar
unknown committed
3317 3318
	ibool		contains_null;
	ulint		i;
unknown's avatar
unknown committed
3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
	
	*n_rows = 0;
	
	buf = mem_alloc(UNIV_PAGE_SIZE);
	heap = mem_heap_create(100);
	
	/* Make a dummy template in prebuilt, which we will use
	in scanning the index entries */

	prebuilt->index = index;
	prebuilt->sql_stat_start = TRUE;
	prebuilt->template_type = ROW_MYSQL_DUMMY_TEMPLATE;
	prebuilt->n_template = 0;
	prebuilt->need_to_access_clustered = FALSE;

 	dtuple_set_n_fields(prebuilt->search_tuple, 0);

	prebuilt->select_lock_type = LOCK_NONE;

	ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, 0);
loop:
	if (ret != DB_SUCCESS) {

		mem_free(buf);
		mem_heap_free(heap);

		return(is_ok);
	}

	*n_rows = *n_rows + 1;
	
	/* row_search... returns the index record in buf, record origin offset
	within buf stored in the first 4 bytes, because we have built a dummy
	template */
	
	rec = buf + mach_read_from_4(buf);
3355

unknown's avatar
unknown committed
3356 3357 3358 3359 3360 3361 3362
	if (prev_entry != NULL) {
		matched_fields = 0;
		matched_bytes = 0;
	
		cmp = cmp_dtuple_rec_with_match(prev_entry, rec,
						&matched_fields,
						&matched_bytes);
unknown's avatar
unknown committed
3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
		contains_null = FALSE;

		/* In a unique secondary index we allow equal key values if
		they contain SQL NULLs */

	        for (i = 0;
                     i < dict_index_get_n_ordering_defined_by_user(index);
		     i++) {
	                if (UNIV_SQL_NULL == dfield_get_len(
                                      dtuple_get_nth_field(prev_entry, i))) {

                        	contains_null = TRUE;
	                }
	        }

unknown's avatar
unknown committed
3378
		if (cmp > 0) {
3379 3380 3381
			fputs("InnoDB: index records in a wrong order in ",
				stderr);
		not_ok:
3382 3383
			dict_index_name_print(stderr,
					prebuilt->trx, index);
3384 3385 3386 3387 3388 3389 3390
			fputs("\n"
				"InnoDB: prev record ", stderr);
			dtuple_print(stderr, prev_entry);
			fputs("\n"
				"InnoDB: record ", stderr);
			rec_print(stderr, rec);
			putc('\n', stderr);
unknown's avatar
unknown committed
3391 3392
			is_ok = FALSE;
		} else if ((index->type & DICT_UNIQUE)
unknown's avatar
unknown committed
3393
			   && !contains_null
unknown's avatar
unknown committed
3394 3395
			   && matched_fields >=
			   dict_index_get_n_ordering_defined_by_user(index)) {
unknown's avatar
Merge  
unknown committed
3396

3397 3398
			fputs("InnoDB: duplicate key in ", stderr);
			goto not_ok;
unknown's avatar
unknown committed
3399 3400 3401 3402 3403 3404 3405
		}
	}

	mem_heap_empty(heap);
	
	prev_entry = row_rec_to_index_entry(ROW_COPY_DATA, index, rec, heap);

unknown's avatar
unknown committed
3406
	ret = row_search_for_mysql(buf, PAGE_CUR_G, prebuilt, 0, ROW_SEL_NEXT);
unknown's avatar
unknown committed
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420

	goto loop;	
}

/*************************************************************************
Checks a table for corruption. */

ulint
row_check_table_for_mysql(
/*======================*/
					/* out: DB_ERROR or DB_SUCCESS */
	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct in MySQL
					handle */
{
unknown's avatar
unknown committed
3421
	dict_table_t*	table		= prebuilt->table;
unknown's avatar
unknown committed
3422 3423
	dict_index_t*	index;
	ulint		n_rows;
3424
	ulint		n_rows_in_table	= ULINT_UNDEFINED;
unknown's avatar
unknown committed
3425 3426
	ulint		ret 		= DB_SUCCESS;
	ulint		old_isolation_level;
unknown's avatar
unknown committed
3427

unknown's avatar
unknown committed
3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441
	if (prebuilt->table->ibd_file_missing) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB: Error:\n"
"InnoDB: MySQL is trying to use a table handle but the .ibd file for\n"
"InnoDB: table %s does not exist.\n"
"InnoDB: Have you deleted the .ibd file from the database directory under\n"
"InnoDB: the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"InnoDB: Look from\n"
"http://dev.mysql.com/doc/mysql/en/InnoDB_troubleshooting_datadict.html\n"
"InnoDB: how you can resolve the problem.\n",
				prebuilt->table->name);
		return(DB_ERROR);
	}

unknown's avatar
unknown committed
3442
	prebuilt->trx->op_info = "checking table";
unknown's avatar
unknown committed
3443

unknown's avatar
unknown committed
3444 3445 3446 3447 3448 3449 3450 3451
	old_isolation_level = prebuilt->trx->isolation_level;

	/* We must run the index record counts at an isolation level
	>= READ COMMITTED, because a dirty read can see a wrong number
	of records in some index; to play safe, we use always
	REPEATABLE READ here */

	prebuilt->trx->isolation_level = TRX_ISO_REPEATABLE_READ;
3452 3453 3454 3455 3456 3457

	/* Enlarge the fatal lock wait timeout during CHECK TABLE. */
	mutex_enter(&kernel_mutex);
	srv_fatal_semaphore_wait_threshold += 7200; /* 2 hours */
	mutex_exit(&kernel_mutex);

unknown's avatar
unknown committed
3458 3459 3460
	index = dict_table_get_first_index(table);

	while (index != NULL) {
3461 3462 3463
		/* fputs("Validating index ", stderr);
		ut_print_name(stderr, index->name);
		putc('\n', stderr); */
unknown's avatar
unknown committed
3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481
	
		if (!btr_validate_tree(index->tree)) {
			ret = DB_ERROR;
		} else {
			if (!row_scan_and_check_index(prebuilt,
							index, &n_rows)) {
				ret = DB_ERROR;
			}

			/* fprintf(stderr, "%lu entries in index %s\n", n_rows,
			  index->name); */

			if (index == dict_table_get_first_index(table)) {
				n_rows_in_table = n_rows;
			} else if (n_rows != n_rows_in_table) {

				ret = DB_ERROR;
 
3482
				fputs("Error: ", stderr);
3483 3484
				dict_index_name_print(stderr,
					prebuilt->trx, index);
unknown's avatar
unknown committed
3485
				fprintf(stderr,
3486 3487
				" contains %lu entries, should be %lu\n",
					(ulong) n_rows,
3488
					(ulong) n_rows_in_table);
unknown's avatar
unknown committed
3489 3490 3491 3492 3493 3494
			}
		}

		index = dict_table_get_next_index(index);
	}

unknown's avatar
unknown committed
3495 3496 3497
	/* Restore the original isolation level */
	prebuilt->trx->isolation_level = old_isolation_level;
	
unknown's avatar
unknown committed
3498 3499 3500 3501 3502 3503 3504 3505
	/* We validate also the whole adaptive hash index for all tables
	at every CHECK TABLE */

	if (!btr_search_validate()) {

		ret = DB_ERROR;
	}

3506 3507 3508 3509 3510
	/* Restore the fatal lock wait timeout after CHECK TABLE. */
	mutex_enter(&kernel_mutex);
	srv_fatal_semaphore_wait_threshold -= 7200; /* 2 hours */
	mutex_exit(&kernel_mutex);

unknown's avatar
unknown committed
3511
	prebuilt->trx->op_info = "";
3512

unknown's avatar
unknown committed
3513 3514
	return(ret);
}