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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: 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 = 'mariadb.sys'@'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,
format_pico_time(sum_timer_wait) AS total_latency,
format_pico_time(avg_timer_wait) AS avg_latency,
format_pico_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;
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