BEGIN DECLARE v_done INT DEFAULT FALSE; DECLARE v_total_tables INT DEFAULT 0; DECLARE v_ps_table VARCHAR(64); DECLARE ps_tables CURSOR FOR SELECT table_name  FROM INFORMATION_SCHEMA.TABLES  WHERE table_schema = 'performance_schema'  AND (table_name LIKE '%summary%'  OR table_name LIKE '%history%'); DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_done = TRUE;  OPEN ps_tables;  ps_tables_loop: LOOP FETCH ps_tables INTO v_ps_table; IF v_done THEN LEAVE ps_tables_loop; END IF;  SET @truncate_stmt := CONCAT('TRUNCATE TABLE performance_schema.', v_ps_table); IF in_verbose THEN SELECT CONCAT('Running: ', @truncate_stmt) AS status; END IF;  PREPARE truncate_stmt FROM @truncate_stmt; EXECUTE truncate_stmt; DEALLOCATE PREPARE truncate_stmt;  SET v_total_tables = v_total_tables + 1; END LOOP;  CLOSE ps_tables;  SELECT CONCAT('Truncated ', v_total_tables, ' tables') AS summary;  END