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-- Copyright (c) 2014, 2025, 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 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: 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,
format_pico_time(SUM(sum_timer_wait)) total_latency,
format_pico_time(MIN(min_timer_wait)) min_latency,
format_pico_time(AVG(avg_timer_wait)) avg_latency,
format_pico_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;
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