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-- 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: wait_classes_global_by_latency
--
-- Lists the top wait classes by total latency, ignoring idle (this may be very large).
--
-- mysql> select * from wait_classes_global_by_latency;
-- +-------------------+--------+---------------+-------------+-------------+-------------+
-- | event_class | total | total_latency | min_latency | avg_latency | max_latency |
-- +-------------------+--------+---------------+-------------+-------------+-------------+
-- | wait/io/file | 550470 | 46.01 s | 19.44 ns | 83.58 us | 4.21 s |
-- | wait/io/socket | 228833 | 2.71 s | 0 ps | 11.86 us | 29.93 ms |
-- | wait/io/table | 64063 | 1.89 s | 99.79 ns | 29.43 us | 68.07 ms |
-- | wait/lock/table | 76029 | 47.19 ms | 65.45 ns | 620.74 ns | 969.88 us |
-- | wait/synch/mutex | 635925 | 34.93 ms | 19.44 ns | 54.93 ns | 107.70 us |
-- | wait/synch/rwlock | 61287 | 7.62 ms | 21.38 ns | 124.37 ns | 34.65 us |
-- +-------------------+--------+---------------+-------------+-------------+-------------+
--
CREATE OR REPLACE
ALGORITHM = TEMPTABLE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW 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,
format_pico_time(SUM(sum_timer_wait)) AS total_latency,
format_pico_time(MIN(min_timer_wait)) min_latency,
format_pico_time(IFNULL(SUM(sum_timer_wait) / NULLIF(SUM(COUNT_STAR), 0), 0)) AS avg_latency,
format_pico_time(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;
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