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We start with the system level factors, because some of these decisions must be made very early. In other cases, a quick look at this section may suffice because it not that important for the big gains. However, it is always nice to have a feeling about how much one could gain by changing things at this level.
The default operating system to use is really important! To get the best use of multiple-CPU machines, you should use Solaris (because its threads implementation works really well) or Linux (because the 2.2 kernel has really good SMP support). Also, older Linux kernels have a 2G file-size limit by default. If you have such a kernel and a desperate need for files larger than 2G, you should get the LFS (large file system) patch for the ext2 filesystem. Other filesystems such as ReiserFS and XFS do not have this 2G limitation.
Because we have not run MySQL in production on that many platforms, we advise you to test your intended platform before choosing it, if possible.
--skip-external-locking
MySQL option to avoid external
locking. Note that this will not impact MySQL's functionality as long as you
only run one server. Just remember to take down the server (or lock and flush
the relevant tables) before you run myisamchk
. On some systems this
option is mandatory, because the external locking does not work in any case.
The --skip-external-locking
option is on by default as of MySQL 4.0.
Before that, it is on by default when compiling with
MIT-pthreads, because flock()
isn't fully supported by
MIT-pthreads on all platforms. It's also on default for Linux
as Linux file locking are not yet safe.
The only case when you can't use --skip-external-locking
is if you run
multiple MySQL servers (not clients) on the same data,
or if you run myisamchk
on the table without telling the server
to flush and lock the tables first.
You can still use LOCK TABLES
/UNLOCK TABLES
even if you
are using --skip-external-locking
.
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