-- 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: x$wait_classes_global_by_latency -- -- Lists the top wait classes by total latency, ignoring idle (this may be very large). -- -- mysql> SELECT * FROM x$wait_classes_global_by_latency; -- +-------------------+---------+----------------+-------------+----------------+--------------+ -- | event_class | total | total_latency | min_latency | avg_latency | max_latency | -- +-------------------+---------+----------------+-------------+----------------+--------------+ -- | wait/io/file | 29468 | 27100905420290 | 0 | 919672370.7170 | 350700491310 | -- | wait/io/table | 224924 | 719670285750 | 116870 | 3199615.3623 | 208579012460 | -- | wait/synch/mutex | 1532036 | 118515948070 | 56550 | 77358.4616 | 2590408470 | -- | wait/io/socket | 1193 | 10677541030 | 0 | 8950160.1257 | 287760330 | -- | wait/lock/table | 6972 | 3674766030 | 109330 | 527074.8752 | 8855730 | -- | wait/synch/rwlock | 13646 | 1579833580 | 37700 | 115772.6499 | 28293850 | -- +-------------------+---------+----------------+-------------+----------------+--------------+ -- CREATE OR REPLACE ALGORITHM = TEMPTABLE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW x$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, SUM(sum_timer_wait) AS total_latency, MIN(min_timer_wait) AS min_latency, IFNULL(SUM(sum_timer_wait) / NULLIF(SUM(COUNT_STAR), 0), 0) AS avg_latency, 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;