Marion Dorsett

The WordPress Database Table Optimizer plugin will automatically make sure that your WordPress MySQL database tables are always optimized.
I’ve also included an admin page located at Manage > Optimize Database. This page will allow you to confirm your WordPress MySQL database tables are optimized, show you the number of rows per table, and the size of the table.
<h3>Arbitrary section</h3>
This plugin uses Aidan Lister size_readable PHP function to show the file sizes of the MySQL tables. I’ve changed the name of the function to avoid naming conflicts with other plugins that may be using this function as well.
http://aidanlister.com/repos/v/function.size_readable.php
Special thanks to David Potter (http://dpotter.net/Technical/) for catching my oversight.
http://www.figmentthinking.com/wordpress-database-table-optimizer/#comment-74

Figment Thinking WordPress Database Table Optimizer

The WordPress Database Table Optimizer plugin will automatically make sure that your WordPress MySQL database…

gerrygooner

This WordPress plugin will cleanup your WordPress database, performing the following actions:
<ul>
<li>Remove all post revisions.</li>
<li>Remove all spam comments.</li>
<li>Remove all unapproved comments.</li>
<li>Remove all unused tags.</li>
<li>Remove all unused post meta.</li>
<li>Optimize MySQL tables by removing all unused table space.</li>
</ul>
Based on WP-Cleanup by JortK, this plugin replaces usage of mysql_query() that was deprecated in PHP 5.5 with WP_Query functions .

Figment Thinking WordPress Database Table Optimizer vs WP-CleanDB