Manual:Database inconsistencies

Database inconsistencies occur when, for example, primary>Special:MyLanguage/Manual:Primary key storage in other fields|primary keys stored in other fields no longer point to a row that exists.

This can happen after a database import ends prematurely, for example.

In that case,  might point to a revision that hasn't been imported, and users trying to read the page might get an error message stating "The revision #0 of the page named '[page name]" does not exist.

This is usually caused by following an outdated history link to a page that has been deleted.

Details can be found in the deletion log.

 can be used to find missing revisions.