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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: x$host_summary_by_stages
--
-- Summarizes stages by host, ordered by host and total latency per stage.
--
-- When the host found is NULL, it is assumed to be a "background" thread.
--
-- mysql> select * from x$host_summary_by_stages;
-- +------+--------------------------------+-------+---------------+-------------+
-- | host | event_name | total | total_latency | avg_latency |
-- +------+--------------------------------+-------+---------------+-------------+
-- | hal | stage/sql/Opening tables | 1114 | 71919037000 | 64559000 |
-- | hal | stage/sql/Creating sort index | 5 | 2245762000 | 449152000 |
-- | hal | stage/sql/init | 13 | 428798000 | 32984000 |
-- | hal | stage/sql/checking permissions | 13 | 363231000 | 27940000 |
-- | hal | stage/sql/freeing items | 7 | 137728000 | 19675000 |
-- | hal | stage/sql/statistics | 6 | 93955000 | 15659000 |
-- | hal | stage/sql/preparing | 6 | 82571000 | 13761000 |
-- | hal | stage/sql/optimizing | 6 | 63338000 | 10556000 |
-- | hal | stage/sql/Sending data | 6 | 53400000 | 8900000 |
-- | hal | stage/sql/closing tables | 7 | 46922000 | 6703000 |
-- | hal | stage/sql/System lock | 6 | 40175000 | 6695000 |
-- | hal | stage/sql/query end | 7 | 31723000 | 4531000 |
-- | hal | stage/sql/Sorting result | 6 | 9855000 | 1642000 |
-- | hal | stage/sql/end | 6 | 9556000 | 1592000 |
-- | hal | stage/sql/cleaning up | 7 | 7312000 | 1044000 |
-- | hal | stage/sql/executing | 6 | 6487000 | 1081000 |
-- +------+--------------------------------+-------+---------------+-------------+
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW x$host_summary_by_stages (
host,
event_name,
total,
total_latency,
avg_latency
) AS
SELECT IF(host IS NULL, 'background', host) AS host,
event_name,
count_star AS total,
sum_timer_wait AS total_latency,
avg_timer_wait AS avg_latency
FROM performance_schema.events_stages_summary_by_host_by_event_name
WHERE sum_timer_wait != 0
ORDER BY IF(host IS NULL, 'background', host), sum_timer_wait DESC;
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