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Kirill Smelkov
mariadb
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eb893a2f
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eb893a2f
authored
Nov 06, 2001
by
arjen@co3064164-a.bitbike.com
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Rewrite/re-arrange of "How stable is MySQL?" section, as per Monty/Kaj request.
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eb893a2f
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@@ -693,76 +693,85 @@ options to obtain online assistance.
@cindex stability
This section addresses the questions ``How stable is MySQL?'' and
``Can I depend on MySQL in this project?'' We will try to clarify
some issues and to answer some of the more important questions that seem to
concern many people. This section has been put together from information
gathered from the mailing list (which is very active in reporting bugs).
At TcX, the predecessor of MySQL AB, MySQL has worked without any problems in
projects since mid-1996. Original code stems back from the early 80s,
providing a table code base, and the ISAM table format remains backwards
compatible. When MySQL was released to a wider public, we noticed that there
were some pieces of ``untested code'' that were quickly found by the new users
who made queries in a manner different than our own. Each new release has had
fewer portability problems than the previous one (even though each has had
many new features).
Each release of MySQL has been usable, and there have been problems
only when users start to use code from the ``gray zones.'' Naturally, outside
users don't know what the gray zones are; this section attempts to indicate
those that are currently known. The descriptions deal with Version 3.23
of MySQL. All known and reported bugs are fixed in the latest
version, with the exception of the bugs listed in the bugs section, which
are things that are design-related. @xref{Bugs}.
MySQL is written in multiple layers and different independent modules.
Some of the new modules are listed below with an indication of how
well-tested each of them is:
This section addresses the questions ``@emph{How stable is MySQL?}''
and ``@emph{Can I depend on MySQL in this project?}''
We will try to clarify these issues and answer some important
questions that concern many potential users. The information in this
section is based on data gathered from the mailing list, which is
very active in identifying problems as well as reporting types of use.
Original code stems back from the early 80s, providing a stable code
base, and the ISAM table format remains backwards compatible.
At TcX, the predecessor of MySQL AB, MySQL has worked in projects
since mid-1996, without any problems.
When MySQL was released to a wider public, we noticed that there were
some pieces of ``untested code'' that were quickly found by the new
users who made different types of queries from us. Each new release
has had fewer portability problems (even though each new release has
had many new features).
Each release of MySQL has been usable. There have only been problems
when users try code from the ``gray zones.'' Naturally, new users
don't know what the gray zones are; this section attempts to indicate
those that are currently known.
The descriptions mostly deal with Version 3.23 of MySQL.
All known and reported bugs are fixed in the latest version, with the
exception of those listed in the bugs section, which are things that
are design-related. @xref{Bugs}.
MySQL design is multi-layered with independent modules. Some of the
newer modules are listed below with an indication of how well-tested
each of them is:
@cindex modules, list of
@table @strong
@item Locking --- Gamma
This is very system-dependent. On some systems there are big problems
using standard OS locking (@code{fcntl()}). In these cases, you should run the
MySQL daemon with the @code{--skip-locking} flag. Problems are known
to occur on some Linux systems, and on SunOS when using NFS-mounted file
systems.
@item @strong{MyODBC 2.50} (uses ODBC SDK 2.5) --- Gamma
It seems to work well with some programs.
@item Replication -- Gamma
We are still working on replication, so don't expect this to be rock
solid yet. On the other hand, some MySQL users are already
using this with good results.
@item BDB Tables -- Gamma
The Berkeley DB code is very stable, but we are still improving the interface
between MySQL and BDB tables, so it will take some time before this
is tested as well as the other table types.
@item InnoDB Tables -- Gamma
This is a recent addition to @code{MySQL}. They appear to work well and
can be used after some initial testing.
@item Automatic recovery of MyISAM tables - Gamma
This only affects the new code that checks if the table was closed properly
on open and executes an automatic check/repair of the table if it wasn't.
@item FULLTEXT -- Beta
Text search seems to work, but is still not widely used.
@item Bulk-insert - Alpha
Large server clusters using replication are in production use, with
good results. Work on enhanced replication features is continuing
in MySQL 4.0.
@item @code{InnoDB} tables -- Gamma
While the @code{InnoDB} transactional table handler is a fairly recent
addition to @code{MySQL}, it appears to work well and is already being
used in some large, heavy load production systems.
@item @code{BDB} tables -- Gamma
The @code{Berkeley DB} code is very stable, but we are still improving
the @code{BDB} transactional table handler interface in MySQL, so it
will take some time before this is as well tested as the other table
types.
@item @code{FULLTEXT} -- Beta
Full text search works but is not yet widely used.
Important enhancements are being implemented for MySQL 4.0.
@item @code{MyODBC 2.50} (uses ODBC SDK 2.5) -- Gamma
Increasingly in wide use. Some issues brought up appear to be
application related and independent of the ODBC driver or underlying
database server.
@item Automatic recovery of @code{MyISAM} tables -- Gamma
This status only regards the new code in the @code{MyISAM} table
handler that checks if the table was closed properly on open and
executes an automatic check/repair of the table if it wasn't.
@item Bulk-insert -- Alpha
New feature in MyISAM in MySQL 4.0 for faster insert of many rows.
@item Locking -- Gamma
This is very system-dependent. On some systems there are big problems
using standard OS locking (@code{fcntl()}). In these cases, you should
run @code{mysqld} with the @code{--skip-locking} flag.
Problems are known to occur on some Linux systems, and on SunOS when
using NFS-mounted file systems.
@end table
MySQL AB provides high-quality support for paying customers, but the
MySQL mailing list usually provides answers to common questions.
Bugs are usually fixed right away with a patch; for serious bugs,
there is
almost always a new release.
Bugs are usually fixed right away with a patch; for serious bugs,
there is
almost always a new release.
@node Table size, Year 2000 compliance, Stability, What-is
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