Just run the following query on your WordPress database, and all revisions (As well as meta associated with it) will be deleted from your database.
- DELETE a,b,c
- FROM wp_posts a
- WHERE a.post_type = 'revision'
- LEFT JOIN wp_term_relationships b
- ON (a.ID = b.object_id)
- LEFT JOIN wp_postmeta c ON (a.ID = c.post_id);
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