''
Table name prefix. This should be alphanumeric, contain neither spaces nor hyphens, and end in "_". If you only have access to a single database and wish to install more than one version of MediaWiki, or have other applications that also use the database, you can give the table names a unique prefix to stop any naming conflicts or confusion.
For example, if you use the prefix 'wiki_' then the table 'page' will be named 'wiki_page' instead.
You need to set this at the time of initial configuration, or manually change the table names at a later date. Changing this setting does not automatically update the names of the tables in your database.
Many installers set the database table prefix "$wgDBprefix
" to "mw_
" by default.[2][3][4]
$wgDBmwschema
after Setup.php has been included. Note: Setup.php initializes various paths, includes some common files, starts sessions, and performs various other setup tasks for a request. It is not related to the installation or setup of MediaWiki.includes/db/
should use $wgDBmwschema
, while everything else should use the dbSchema() method provided by the Wikimedia\Rdbms\IDatabase
interface or extract it from the getDomainId()
method in either the Wikimedia\Rdbms\ILoadBalancer
or the Wikimedia\Rdbms\ILBFactory
interface. The DatabaseDomain
class can extract such components from a database domain ID.$wgDBservers
or $wgLBFactoryConf
, you still need to define $wgDBname
, $wgDBmwschema
(if applicable for the DB type), and $wgDBprefix
(if applicable for the DB type). The combination of $wgDBname
, $wgDBmwschema
, and $wgDBprefix
define the current wiki's database domain. This is also called the local database domain. The 'dbname' and 'tablePrefix' settings in $wgDBservers
and $wgLBFactoryConf
only define the default DB/prefix when a connection is requested with DatabaseDomain::newUnspecified()->getId()
(the empty string) as the database domain, e.g. wfGetDB( DB_REPLICA, [], '' )
. Note that functions calls like wfGetDB( DB_REPLICA )
, which simply omit the database domain, are assumed to refer to the local database domain./*_*/
is used for $wgDBprefix
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