-------+\n | Enabled 1 thread |\n +------------------+\n 1 row in set (0.00 sec)\n ' SQL SECURITY INVOKER NOT DETERMINISTIC MODIFIES SQL DATA BEGIN UPDATE performance_schema.threads SET instrumented = 'YES' WHERE processlist_id = in_connection_id;  SELECT CONCAT('Enabled ', @rows := ROW_COUNT(), ' thread', IF(@rows != 1, 's', '')) AS summary; END;