Manual:$wgSharedSchema

Shared DB settings: $wgSharedSchema
The table schema for the shared database
Introduced in version:1.23.0 (Gerrit change 173063; git #I291e770)
Removed in version:still in use
Allowed values:(boolean)
Default value:false

Details edit

If set to false, it'll fallback to the value of $wgDBmwschema . This fallback is set in Setup.php .

// Set default shared schema
if ( $wgSharedSchema === false ) {
	$wgSharedSchema = $wgDBmwschema;
}

See also edit