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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_global_by_latency
--
-- Lists the top wait events by their total latency, ignoring idle (this may be very large).
--
-- mysql> select * from waits_global_by_latency limit 5;
-- +--------------------------------------+------------+---------------+-------------+-------------+
-- | event | total | total_latency | avg_latency | max_latency |
-- +--------------------------------------+------------+---------------+-------------+-------------+
-- | wait/io/file/myisam/dfile | 3623719744 | 00:47:49.09 | 791.70 ns | 312.96 ms |
-- | wait/io/table/sql/handler | 69114944 | 00:44:30.74 | 38.64 us | 879.49 ms |
-- | wait/io/file/innodb/innodb_log_file | 28100261 | 00:37:42.12 | 80.50 us | 476.00 ms |
-- | wait/io/socket/sql/client_connection | 200704863 | 00:18:37.81 | 5.57 us | 1.27 s |
-- | wait/io/file/innodb/innodb_data_file | 2829403 | 00:08:12.89 | 174.20 us | 455.22 ms |
-- +--------------------------------------+------------+---------------+-------------+-------------+
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW waits_global_by_latency (
events,
total,
total_latency,
avg_latency,
max_latency
) AS
SELECT 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_global_by_event_name
WHERE event_name != 'idle'
AND sum_timer_wait > 0
ORDER BY sum_timer_wait DESC;
|
