“Optimize database after deleting revisions” WordPress plugin help you:
– automatically delete from WordPress database unnecessary post or pages revisions (stored into database as a new record any time you save post/page changes) of posts and pages;
– automatically clear posts/pages trash;
– delete spam comments;
– setup revisions limit for every post;
– execute MySQL optimize command against all WordPress database tables.
First, visit plugin options page under WordPress Settings menu:

Then go to WordPress Tools menu and start optimization:

Wait a minute and get your WordPress database clean and optimized:

Look on “Optimize database after deleting revisions” WordPress plugin in action: