-- 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$wait_classes_global_by_avg_latency -- -- Lists the top wait classes by average latency, ignoring idle (this may be very large). -- -- mysql> select * from x$wait_classes_global_by_avg_latency; -- +-------------------+---------+-------------------+-------------+--------------------+------------------+ -- | event_class | total | total_latency | min_latency | avg_latency | max_latency | -- +-------------------+---------+-------------------+-------------+--------------------+------------------+ -- | idle | 4331 | 16044682716000000 | 2000000 | 3704613880397.1369 | 1593550454000000 | -- | wait/io/file | 23037 | 20856702551880 | 0 | 905356711.0249 | 350700491310 | -- | wait/io/table | 224924 | 719670285750 | 116870 | 3199615.3623 | 208579012460 | -- | wait/lock/table | 6972 | 3674766030 | 109330 | 527074.8752 | 8855730 | -- | wait/synch/rwlock | 11916 | 1273279800 | 37700 | 106854.6324 | 6838780 | -- | wait/synch/mutex | 1031881 | 80464286240 | 56550 | 77978.2613 | 2590408470 | -- +-------------------+---------+-------------------+-------------+--------------------+------------------+ -- CREATE OR REPLACE ALGORITHM = TEMPTABLE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW x$wait_classes_global_by_avg_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 event_class ORDER BY IFNULL(SUM(sum_timer_wait) / NULLIF(SUM(COUNT_STAR), 0), 0) DESC;