-- Copyright (c) 2014, 2021, 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: x$waits_global_by_latency
--
-- Lists the top wait events by their total latency, ignoring idle (this may be very large).
--
-- mysql> select * from x$waits_global_by_latency limit 5;
-- +--------------------------------------+-------+---------------+-------------+--------------+
-- | event                                | total | total_latency | avg_latency | max_latency  |
-- +--------------------------------------+-------+---------------+-------------+--------------+
-- | wait/io/file/sql/file_parser         |   679 | 3536136351540 |  5207858773 | 129860439800 |
-- | wait/io/file/innodb/innodb_data_file |   195 |  848170566100 |  4349592637 | 350700491310 |
-- | wait/io/file/sql/FRM                 |  1355 |  400428476500 |   295518990 |  44823120940 |
-- | wait/io/file/innodb/innodb_log_file  |    20 |   54298899070 |  2714944765 |  30108124800 |
-- | wait/io/file/mysys/charset           |     3 |   24244722970 |  8081574072 |  24151547420 |
-- +--------------------------------------+-------+---------------+-------------+--------------+
--

CREATE OR REPLACE
  ALGORITHM = MERGE
  DEFINER = 'mysql.sys'@'localhost'
  SQL SECURITY INVOKER 
VIEW x$waits_global_by_latency (
  events,
  total,
  total_latency,
  avg_latency,
  max_latency
) AS
SELECT event_name AS event,
       count_star AS total,
       sum_timer_wait AS total_latency,
       avg_timer_wait AS avg_latency,
       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;
