Commit 68938f7f authored by Julien Muchembled's avatar Julien Muchembled

Add upgrade note to migrate existing MySQL storages

parent 748fc334
NEO 0.10
========
The format of MySQL tables has changed in NEO 0.10 and there is no backward
compatibility or transparent migration, so you will have to use the following
SQL commands to migrate each storage from NEO < 0.10::
-- make sure 'tobj' is empty first
DROP TABLE obj_short, tobj;
ALTER TABLE obj CHANGE checksum hash BINARY(20) NULL;
UPDATE obj SET value=NULL WHERE value='';
UPDATE obj SET hash=UNHEX(SHA1(value));
ALTER TABLE obj ADD KEY (hash(4));
CREATE TABLE data (hash BINARY(20) NOT NULL PRIMARY KEY, compression TINYINT UNSIGNED NULL, value LONGBLOB NULL) ENGINE = InnoDB SELECT DISTINCT hash, compression, value FROM obj WHERE hash IS NOT NULL;
ALTER TABLE obj DROP compression, DROP value;
UPDATE obj, obj as undone SET obj.hash=undone.hash WHERE obj.value_serial IS NOT NULL AND obj.partition=undone.partition AND obj.oid=undone.oid AND obj.value_serial=undone.serial;
If 'tobj' is not empty, this means your cluster was not shutdown properly.
Restart it to flush the last committed transaction.
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