Manual:$wgLocalisationCacheConf

Details
Localisation cache configuration.

Associative array with keys:

The class to use. May be overridden by extensions. The location to store cache data. May be 'files', 'db' or 'detect'. The class name for the underlying storage. If set to a class name, it overrides the "store" setting. Set this to true to disable cache updates on web requests. Use  instead.
 * class:
 * store:
 * If set to "files", data will be in CDB files in the directory specified by  .
 * If set to "db", data will be stored to the database.
 * If set to "detect", files will be used if   is set, otherwise the database will be used.
 * storeClass:
 * manualRecache: