The wiki ID (or database ID) is the most common way of identifying a wiki within a wiki farm in MediaWiki.
When every wiki is in a separate database, it is simply the database name; when multiple wikis share a database and are differentiated with table prefixes, it is in the form {{tag2|plain=1|db name}}-{{tag2|plain=1|table prefix}}.
It can be retrieved by calling WikiMap::getCurrentWikiId() (in older versions of MediaWiki, wfWikiID()).
It is used for getting a database connection for a given wiki (see LoadBalancer::getConnection()) and in $wgConf, among other things.
See also
- $wgDBname
- $wgDBprefix
- Wikimedia\Rdbms\DatabaseDomain
- wfWikiID()
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