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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: user_summary_by_file_io
--
-- Summarizes file IO totals per user.
--
-- When the user found is NULL, it is assumed to be a "background" thread.
--
-- mysql> select * from user_summary_by_file_io;
-- +------------+-------+------------+
-- | user | ios | io_latency |
-- +------------+-------+------------+
-- | root | 26457 | 21.58 s |
-- | background | 1189 | 394.21 ms |
-- +------------+-------+------------+
--
CREATE OR REPLACE
ALGORITHM = TEMPTABLE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW user_summary_by_file_io (
user,
ios,
io_latency
) AS
SELECT IF(user IS NULL, 'background', user) AS user,
SUM(count_star) AS ios,
format_pico_time(SUM(sum_timer_wait)) AS io_latency
FROM performance_schema.events_waits_summary_by_user_by_event_name
WHERE event_name LIKE 'wait/io/file/%'
GROUP BY IF(user IS NULL, 'background', user)
ORDER BY SUM(sum_timer_wait) DESC;
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