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Updated on March 7, 2026 By the end of November 2025, we launched Advanced DB Cleaner version 4, our most...

All lifetime license (LTD) users of version 3.x will now receive version 4.x through a normal plugin update. After further...

Upgrade for LTD users: Please read here For more than a decade, Advanced Database Cleaner (ADC) has helped WordPress users...

What are trashed comments? When you delete a comment in WordPress, it isn’t removed immediately. Instead, it’s moved to the...

What are duplicated commentmeta? Each comment in WordPress can have metadata, known as commentmeta, which stores additional information added by...

What are duplicated postmeta? Each post in WordPress can have metadata, known as postmeta, which stores additional information such as...

What are unapproved comments? Unapproved comments are those awaiting moderation in WordPress. When visitors submit a comment, it may be...

What are trashed posts? When you delete a post, page, or any custom post type in WordPress, it isn’t permanently...

What are unused commentmeta? WordPress stores comment-related metadata in the wp_commentmeta table. These data entries contain additional details added by...

What are unused usermeta? User metadata, stored in the wp_usermeta table, holds additional data for each user account such as...

What is Action Scheduler data? The Action Scheduler is a background task system used by plugins such as WooCommerce to...

What are “tables to optimize”? As your site runs, database tables accumulate overhead (fragmented free space) from inserts, updates, and...