Maatkit is a pretty useful set of utilities for MySQL. From their site:
You can use Maatkit to prove replication is working correctly, fix corrupted data, automate repetitive tasks, speed up your servers, and much, much more.
One of the first things you can do after installing the toolkit
(which may already be installed if you are running CentOS or
Debian) is to run the
mk-audit utility. It will give
you a nice summary of your server, as well as point out potential
problems in your configuration.
Here's a list of all the utilities included in Maatkit: