words of wisdom from a systems engineer

MySQLTuner Revision 26 is now available

As some subversion users may have noticed, revision 23 of MySQLTuner was released quietly on Sunday. Thanks to Mike Jackson, a few bugs from revision 23 were smashed today and revision 26 was released this morning.

To pick up the new script, visit the MySQLTuner site.

Here’s some of the new features:

» Shows banner of enabled and disabled storage engines

Near the top of the MySQLTuner output, you’ll find a line like this:

</p> <pre>[**] Status: -Archive -BDB -Federated +InnoDB -ISAM -NDBCluster</pre> <p>

Of course, this is shown in color within the terminal, but all enabled storage engines are shown in green with a plus sign at the front. Disabled storage engines are shown in red and are prepended with a minus sign.

» Recommends disabling unused storage engines

If MySQLTuner finds storage engines enabled that are not in use, it will recommend that they are disabled to save resources:

</p> <pre>[!!] InnoDB is enabled but isn't being used</pre> <p>

» Calculates total data corresponding to storage engines

Any storage engines in use are shown with the total amount of data stored using those engines:

</p> <pre>[**] Data in MyISAM tables: 9G [**] Data in InnoDB tables: 189M [**] Data in MEMORY tables: 0B</pre> <p>

» Displays exact counts in addition to percentages

For some results where percents are shown, exact counts are being displayed as well:

</p> <pre>[OK] Slow queries: 0% (1/4M) [OK] Highest usage of available connections: 56% (17/30)</pre> <p>

» Initial InnoDB support

As an initial step towards InnoDB support, the innodb_buffer_pool_size is compared to the total amount of InnoDB data stored on the server:

</p> <pre>[OK] InnoDB data size / buffer pool: 189.7M/384.0M</pre> <p>

» Other minor changes

  • Added additional section headers to further organize the output
  • Merged the total buffers lines into one for more compact output
  • Added MySQL 5.1 to the supported list to prepare for upcoming GA release
  • For filesize amounts less than 1024 bytes, the “B” letter is shown to represent bytes
  • InnoDB log file recommendation removed due to bad implementations based on recommendations
  • Switches from spaced indents to tabbed indents