Database reports query MediaWiki in search of patterns. Their output helps users by providing them with utility reports, used by community members to improve the encyclopedia (e.g., Untagged stubs (configuration)) and statistical reports, which have past and present informational value (e.g., Page count by namespace (configuration)).
Many reports such as these can be generated with the Quarry service.
Please discuss the current reports or suggest a new report on the talk page.
An index of disabled reports is available here.