Manual:Wiki ID

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 ‎<db name>-‎<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.

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