Disable Post Revisions in WordPress

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'

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