Actor migration/hi

ऐतिहासिक रूप से मीडियाविकि दूसरे सदस्यों के अपने सन्दर्भों (जैसे किसी अवतरण या चित्र के लेखक) को  जोड़ी के रूप में रखता था, और गुमनाम संपादनों के लिए   के रूप में। यह जगह की बर्बादी थी, इससे बहुत सारे अवतरणों वाले विकियों पर प्रदर्शन में कमी आती थी, और इससे सदस्यों के नाम को बदलना या T133452 जैसे नए लेखकों को लाना मुश्किल हो गया था। MediaWiki 1.31 introduces the concept of actors (someone who makes an action, such as an edit or a log event; currently either a registered user or an anonymous one), and a migration process towards a new database schema, with fields like  and   replaced by fields like. 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.