The Post Revisions feature in WordPress takes up database space that I’d rather not waste. So I found out how to disable the feature. Add this to wp-config.php
:
// disable post revisions
define('WP_POST_REVISIONS', false);
Then, clean up the database with this SQL:
DELETE a,b,c
FROM wp_posts a
LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id)
LEFT JOIN wp_postmeta c ON (a.ID = c.post_id)
WHERE a.post_type = 'revision'