Manual:Maintenance scripts/Configuration/en

The  and   configuration variables must be set in order to run maintenance scripts that need to alter the structure of the database (like ) if the user configured in  doesn't have enough permissions. Alternatively, you can pass the --dbuser and --dbpass parameters to the script. The values for these variables differ based on the database engine that is being used to power your installation of MediaWiki. If not configured, it will use the user configured in.

MySQL
Some of the maintenance scripts require database permissions that, for security reasons, the main MediaWiki database account should not have. A separate database account with 'superuser' privileges for just the MediaWiki database should be created (if it does not already exist.) If the database that you use for MediaWiki is called, then the following SQL would create such a user who can exercise superuser privileges on localhost.:

Once the account exists, the account name should be set in the  configuration variable. Like other configuration variables, should be set in. A password for must be set in the   configuration variable.

PostgreSQL
PostgreSQL uses a different security model than MySQL and the same PostgreSQL server account used for day-to-day operation of the MediaWiki installation must also be used for running the maintenance scripts. This is necessary to ensure that the owner for new tables created by the maintenance scripts is set correctly. You don't need to set or  at all.