-- 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: waits_by_host_by_latency -- -- Lists the top wait events per host by their total latency, ignoring idle (this may be very large). -- -- mysql> select * from sys.waits_by_host_by_latency where host != 'background' limit 5; -- +-----------+------------------------------+-------+---------------+-------------+-------------+ -- | host | event | total | total_latency | avg_latency | max_latency | -- +-----------+------------------------------+-------+---------------+-------------+-------------+ -- | localhost | wait/io/file/sql/file_parser | 1386 | 14.50 s | 10.46 ms | 357.36 ms | -- | localhost | wait/io/file/sql/FRM | 162 | 356.08 ms | 2.20 ms | 75.33 ms | -- | localhost | wait/io/file/myisam/kfile | 410 | 322.29 ms | 786.08 us | 65.98 ms | -- | localhost | wait/io/file/myisam/dfile | 1327 | 307.44 ms | 231.68 us | 37.16 ms | -- | localhost | wait/io/file/sql/dbopt | 89 | 180.34 ms | 2.03 ms | 63.41 ms | -- +-----------+------------------------------+-------+---------------+-------------+-------------+ -- CREATE OR REPLACE ALGORITHM = MERGE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW waits_by_host_by_latency ( host, event, total, total_latency, avg_latency, max_latency ) AS SELECT IF(host IS NULL, 'background', host) AS host, event_name AS event, count_star AS total, sys.format_time(sum_timer_wait) AS total_latency, sys.format_time(avg_timer_wait) AS avg_latency, sys.format_time(max_timer_wait) AS max_latency FROM performance_schema.events_waits_summary_by_host_by_event_name WHERE event_name != 'idle' AND sum_timer_wait > 0 ORDER BY host, sum_timer_wait DESC;