Manual:$wgLocalDatabases

Details
An array of database names. E.g.,

This is used for e.g.  (SiteConfiguration). Note that should be the same as.

It is needed to run a wiki family, for example by using .

It is also in use by some maintenance scripts like:

User rights on other wikis on this site can be administered from a single developer account (permission: userrights-interwiki ).

Troubleshooting
For unclear reasons, since this variable is empty as default, some maintenance scripts will do nothing as default. Some of these are:


 * - clear the interwiki cache
 * - clear messages
 * - delete pages with spam URLs

In fact, these scripts do operations on your "local databases" but is not considered one of them as default. A useful contribution would be to clarify this.