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-- Copyright (c) 2014, 2023, Oracle and/or its affiliates. -- -- This program is free software; you can redistribute it and/or modify -- it under the terms of the GNU General Public License, version 2.0, -- as published by the Free Software Foundation. -- -- This program is also distributed with certain software (including -- but not limited to OpenSSL) that is licensed under separate terms, -- as designated in a particular file or component or in included license -- documentation. The authors of MySQL hereby grant you an additional -- permission to link the program and your derivative works with the -- separately licensed software that they have included with MySQL. -- -- 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, version 2.0, 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: io_by_thread_by_latency -- -- Show the top IO consumers by thread, ordered by total latency -- -- mysql> select * from io_by_thread_by_latency; -- +---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+ -- | user | total | total_latency | min_latency | avg_latency | max_latency | thread_id | processlist_id | -- +---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+ -- | root@localhost | 11580 | 18.01 s | 429.78 ns | 1.12 ms | 181.07 ms | 25 | 6 | -- | main | 1358 | 1.31 s | 475.02 ns | 2.27 ms | 350.70 ms | 1 | NULL | -- | page_cleaner_thread | 654 | 147.44 ms | 588.12 ns | 225.44 us | 46.41 ms | 18 | NULL | -- | io_write_thread | 131 | 107.75 ms | 8.60 us | 822.55 us | 27.69 ms | 8 | NULL | -- | io_write_thread | 46 | 47.07 ms | 10.64 us | 1.02 ms | 16.90 ms | 9 | NULL | -- | io_write_thread | 71 | 46.99 ms | 9.11 us | 661.81 us | 17.04 ms | 11 | NULL | -- | io_log_thread | 20 | 21.01 ms | 14.25 us | 1.05 ms | 7.08 ms | 3 | NULL | -- | srv_master_thread | 13 | 17.60 ms | 8.49 us | 1.35 ms | 9.99 ms | 16 | NULL | -- | srv_purge_thread | 4 | 1.81 ms | 34.31 us | 452.45 us | 1.02 ms | 17 | NULL | -- | io_write_thread | 19 | 951.39 us | 9.75 us | 50.07 us | 297.47 us | 10 | NULL | -- | signal_handler | 3 | 218.03 us | 21.64 us | 72.68 us | 154.84 us | 19 | NULL | -- +---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+ -- CREATE OR REPLACE ALGORITHM = TEMPTABLE DEFINER = 'mysql.sys'@'localhost' SQL SECURITY INVOKER VIEW io_by_thread_by_latency ( user, total, total_latency, min_latency, avg_latency, max_latency, thread_id, processlist_id ) AS SELECT IF(processlist_id IS NULL, SUBSTRING_INDEX(name, '/', -1), CONCAT(processlist_user, '@', processlist_host) ) user, SUM(count_star) total, sys.format_time(SUM(sum_timer_wait)) total_latency, sys.format_time(MIN(min_timer_wait)) min_latency, sys.format_time(AVG(avg_timer_wait)) avg_latency, sys.format_time(MAX(max_timer_wait)) max_latency, thread_id, processlist_id FROM performance_schema.events_waits_summary_by_thread_by_event_name LEFT JOIN performance_schema.threads USING (thread_id) WHERE event_name LIKE 'wait/io/file/%' AND sum_timer_wait > 0 GROUP BY thread_id, processlist_id, user ORDER BY SUM(sum_timer_wait) DESC;