You can start the Optimization in the WP Admin Panel » Optimize Database.<br /> Note: if you use the Scheduler the Optimization will run automatically!<br /> Note: you also can click the 'Optimize DB (1 click)' link in the admin bar (if enabled)<br /> You can click one of the following buttons:<br /> 'Analyze (summary): analyzes the database and gives the count of what will be cleaned<br /> 'Analyze (detail): analyzes the database and gives a detailed report of what will be deleted<br /> 'Optimize (summary): actually deletes the items and gives the count of what has been deleted<br /> 'Optimize (detail): actually deletes the items and gives a detailed report of what has been deleted<br />