wfWaitForSlaves();
$this->commitTransaction( $db, __METHOD__ );
$q = $db->limitResult( "DELETE /* deleteSelfExternals */ FROM externallinks WHERE el_to"
wfWaitForSlaves();
$this->commitTransaction( $db, __METHOD__ );
$q = $db->limitResult( "DELETE /* deleteSelfExternals */ FROM externallinks WHERE el_to"