How to turn off post revision recording in Wordpress.
Wordpress actually keep a database record every time you make a change on your post. This can be a waste of database space and resource in the long run. Follow the tips below to turn it off if you do not need this feature.

milly 6:53 pm on December 5, 2009
You can turn off post revision by adding the following line to the wp_config.php file
define(’WP_POST_REVISIONS’, false);If you want to keep the post revision for record purpose, you can limit the number of revisions saved per post. In your wp_config.php file, add the following line instead:define(’WP_POST_REVISIONS’, number_of_revision);Note: Replace the “number_of_revision” with the number of revision copy you want to keep.