Manual:Null revision

A null revision is a special type of page revision that occurs only with specific types of actions performed on pages or their revisions. In the database, the null revision has the same revision.rev_text_id as its parent. It causes the log event to be displayed in the page history.

A null revision may be created through RevisionStore::newNullRevision() or PageUpdater::setForceEmptyRevision() .

Actions that create null revisions

• Imports
• Page moves
• Page protection, unprotection, or changing protection level

Actions that do not create null revisions

In these cases, revision rows are created with new ids.

• Changing visibility of deletions (RevisionDelete )
• Merges
• Page deletions
• Page restorations
• Patrol events

See also

• Manual:Revision
• Manual:PageUpdater.php