Slaver

Disable revision functions in WordPress and delete all entries of revisions in database. 
It is extremely important to back up your database before install this plugin.

Disable Revisions

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

Dion Hulse

** Support for this plugin is NOT offered, This plugin still however works. Please don’t expect support requests to be answered, or “This doesn’t work” reviews to be responded to. **
Revision Control is a plugin for WordPress which gives the user more control over the Revision functionality.
The plugin allows the user to set a site-global setting (Settings -> Revisions) for pages/posts to enable/disable/limit the number of revisions which are saved for the page/post. The user may change this setting on a per-page/post basis from the Revisions Meta box.
The plugin also allows the deletion of specific revisions via the Revisions post metabox.

Revision Control

Revision Control allows finer control over the Post Revision system included with WordPress

Disable Revisions vs Revision Control