The WP Statistics is a widely used plugin with over 600k active installations and is used as a self-hosted solution to track analytics. The WP Statistics plugin uses the following custom database tables for data storage; wp_statistics_exclusions wp_statistics_historical wp_statistics_pages wp_statistics_search wp_statistics_useronline wp_statistics_visit wp_statistics_visitor wp_statistics_visitor_relationships The plugin does not have a built-in way to clean or delete the custom database tables other than manually deleting the custom tables using an application such as phpMyAdmin, or a plugin such as WP-Optimize. If you use the WP-Optimize plugin to find the left-over database tables for the WP Statistics plugin, navigate to; WP-Optimize >