Database settings: $wgSearchType
Type of search used for the wiki.
Introduced in version:1.4.0
Removed in version:still in use
Allowed values:(string) or null. See below for valid values.
Default value:null (1.5+)
"MyISAM" (1.4)

Details edit

Leave as null to select the default search engine for the selected database type (e.g. SearchMySQL, SearchPostgres or SearchOracle), or set to a class name to override to a custom search engine.

See also edit