-- 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: 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 = 'root'@'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 GROUP BY IF(host IS NULL, 'background', host) ORDER BY SUM(sum_timer_wait) DESC;