-- Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. -- -- This program is free software; you can redistribute it and/or modify -- it under the terms of the GNU General Public License as published by -- the Free Software Foundation; version 2 of the License. -- -- This program is distributed in the hope that it will be useful, -- but WITHOUT ANY WARRANTY; without even the implied warranty of -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -- GNU General Public License for more details. -- -- You should have received a copy of the GNU General Public License -- along with this program; if not, write to the Free Software -- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -- -- View: wait_classes_global_by_latency -- -- Lists the top wait classes by total latency, ignoring idle (this may be very large). -- -- mysql> select * from wait_classes_global_by_latency; -- +-------------------+--------+---------------+-------------+-------------+-------------+ -- | event_class | total | total_latency | min_latency | avg_latency | max_latency | -- +-------------------+--------+---------------+-------------+-------------+-------------+ -- | wait/io/file | 550470 | 46.01 s | 19.44 ns | 83.58 us | 4.21 s | -- | wait/io/socket | 228833 | 2.71 s | 0 ps | 11.86 us | 29.93 ms | -- | wait/io/table | 64063 | 1.89 s | 99.79 ns | 29.43 us | 68.07 ms | -- | wait/lock/table | 76029 | 47.19 ms | 65.45 ns | 620.74 ns | 969.88 us | -- | wait/synch/mutex | 635925 | 34.93 ms | 19.44 ns | 54.93 ns | 107.70 us | -- | wait/synch/rwlock | 61287 | 7.62 ms | 21.38 ns | 124.37 ns | 34.65 us | -- +-------------------+--------+---------------+-------------+-------------+-------------+ -- CREATE OR REPLACE ALGORITHM = TEMPTABLE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW wait_classes_global_by_latency ( event_class, total, total_latency, min_latency, avg_latency, max_latency ) AS SELECT SUBSTRING_INDEX(event_name,'/', 3) AS event_class, SUM(COUNT_STAR) AS total, sys.format_time(SUM(sum_timer_wait)) AS total_latency, sys.format_time(MIN(min_timer_wait)) min_latency, sys.format_time(IFNULL(SUM(sum_timer_wait) / NULLIF(SUM(COUNT_STAR), 0), 0)) AS avg_latency, sys.format_time(MAX(max_timer_wait)) AS max_latency FROM performance_schema.events_waits_summary_global_by_event_name WHERE sum_timer_wait > 0 AND event_name != 'idle' GROUP BY SUBSTRING_INDEX(event_name,'/', 3) ORDER BY SUM(sum_timer_wait) DESC;