THM = TEMPTABLE DEFINER = 'mysql.sys'@'localhost' SQL SECURITY INVOKER  VIEW x$host_summary_by_file_io ( host, ios, io_latency ) AS SELECT IF(host IS NULL, 'background', host) AS host, SUM(count_star) AS ios, SUM(sum_timer_wait) AS io_latency  FROM performance_schema.events_waits_summary_by_host_by_event_name WHERE event_name LIKE 'wait/io/file/%' GROUP BY IF(host IS NULL, 'background', host) ORDER BY SUM(sum_timer_wait) DESC;