Actor migration/cs

Historically, MediaWiki has stored references to users (such as the author of a revision or an image) as an  pair, with   for anonymous edits. To bylo plýtvání úložným prostorem, způsobovalo problémy s výkonem na wiki s velkým počtem revizí a bylo velmi obtížné přejmenovat uživatele nebo představit nové typy autorů, jako je T133452. MediaWiki 1.31 zavádí koncept „herců“ (někoho, kdo provádí akci, jako je editace nebo událost protokolu; aktuálně buď registrovaný uživatel nebo anonymní), a migrační proces směrem k novému databázovému schématu s poli jako  a   nahrazené poli jako. Due to the huge size of the English Wikipedia revision table, which must be fully migrated before the changes can be cleaned up, the migration is being done gradually, over several MediaWiki releases. It is expected to finish in MediaWiki 1.34.

The migration will create an table record for every distinct   /   pair, and replace those pairs with a reference to the actor row ID. The following columns are being migrated:

To avoid doing a costly ALTER TABLE on the extremely huge revision tables of large Wikipedia wikis,  and   are initially copied to the  table and from there back to. The revision_actor_temp table will be dropped afterwards.

If you are a wiki owner, you probably don't need to do anything, the migration will happen automatically when you run. If you want to control when the migration happens, see and the  maintenance script.

If you are an extension developer, and your extension does direct DB access to some of the affected fields, you'll need to update your queries (and ideally use the  methods, such as , instead of manually constructing your query). During the migration period, you can also use the  class to get schema/field information that respects any   settings.

If you are a tool developer using, there might be performance implications, even if you don't use any of the affected fields directly. See wikitech:News/Actor storage changes on the Wiki Replicas for additional information.