RMvalues

Revision Post is the new features of WordPress ver 2.6 and above. Every time you made a change to your post or page, it will automatic save add a revision, just like a draft. As many as you made change, the more revision you will have in your database. It will not only increase your database size, but also increase your load time as the server need more time to access the database.
Revision Manager is your choice to remove all the revisions quickly to help you to increase the speed of implementation of the SQL statement, and increase the speed of your server load.

Revision Removal

Remove the revision posts from your database in order to reduce your database size and optimize the speed of your database load!

tweetysha

This plugin will disable revision function in WordPress and delete all entries of revisions in database.
It is extremely important to back up your database before install this plugin if you want to keep backup of your revisions.

TW Disable Revisions

Disable revision function in WordPress and delete all entries of revisions in database.

Revision Removal vs TW Disable Revisions