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-- Copyright (c) 2014, 2023, Oracle and/or its affiliates.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License, version 2.0,
-- as published by the Free Software Foundation.
--
-- This program is also distributed with certain software (including
-- but not limited to OpenSSL) that is licensed under separate terms,
-- as designated in a particular file or component or in included license
-- documentation. The authors of MySQL hereby grant you an additional
-- permission to link the program and your derivative works with the
-- separately licensed software that they have included with MySQL.
--
-- 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, version 2.0, 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: host_summary_by_file_io
--
-- Summarizes file IO totals per host.
--
-- When the host found is NULL, it is assumed to be a "background" thread.
--
-- mysql> select * from host_summary_by_file_io;
-- +------------+-------+------------+
-- | host | ios | io_latency |
-- +------------+-------+------------+
-- | hal1 | 26457 | 21.58 s |
-- | hal2 | 1189 | 394.21 ms |
-- +------------+-------+------------+
--
CREATE OR REPLACE
ALGORITHM = TEMPTABLE
DEFINER = 'mysql.sys'@'localhost'
SQL SECURITY INVOKER
VIEW host_summary_by_file_io (
host,
ios,
io_latency
) AS
SELECT IF(host IS NULL, 'background', host) AS host,
SUM(count_star) AS ios,
sys.format_time(SUM(sum_timer_wait)) AS io_latency
FROM performance_schema.events_waits_summary_by_host_by_event_name
WHERE event_name LIKE 'wait/io/file/%'
GROUP BY IF(host IS NULL, 'background', host)
ORDER BY SUM(sum_timer_wait) DESC;