Optimize WP Database - WP Sweep - https://wordpress.org/plugins/wp-sweep/ - The one I use. Simple, easy. CAUTION: be careful using this. OK to do: Post Sweep, Comment Sweep, User Sweep OK if there are NO DRAFTS; not OK on Zamir with empty default 2ndary nav menu: Term Sweep CAUTION with: Option and DB Sweep (With Zamir, I optimized DB via phpMyAdmin) - WP CleanUp (installed this on ASK) https://wordpress.org/plugins/wp-clean-up/ - This is the one I used. Not compatible with current WP4.2.2 - WP-Optimize (4.6 stars on WP.org; hasn't been updated in 2 yrs.) https://wordpress.org/plugins/wp-optimize/ - Recommended by wpmudev. Simple but effective plugin allows you to extensively clean up your WordPress database and optimize it without doing manual queries. - WP Database Optimizer (hasn't been updated in 2 yrs.) - WP DBManager - https://wordpress.org/plugins/wp-dbmanager/ - Optimize Database after Deleting Revisions - https://wordpress.org/plugins/rvg-optimize-database/ - Recommended by wpmudev. Optimizes the WordPress Database after Cleaning it out WPBeginner says: Also because the main distinguishing characteristic of WP-Sweep is that it uses proper WordPress delete functions as much as possible instead of running direct delete MySQL queries. Whereas the WP-Optimize plugin uses direct delete SQL queries which can leave orphaned data left behind.