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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: waits_by_user_by_latency
--
-- Lists the top wait events per user by their total latency, ignoring idle (this may be very large).
--
-- mysql> select * from waits_by_user_by_latency;
-- +------+-----------------------------------------------------+--------+---------------+-------------+-------------+
-- | user | event | total | total_latency | avg_latency | max_latency |
-- +------+-----------------------------------------------------+--------+---------------+-------------+-------------+
-- | root | wait/io/file/sql/file_parser | 13743 | 00:01:00.46 | 4.40 ms | 231.88 ms |
-- | root | wait/io/file/innodb/innodb_data_file | 4699 | 3.02 s | 643.38 us | 46.93 ms |
-- | root | wait/io/file/sql/FRM | 11462 | 2.60 s | 226.83 us | 61.72 ms |
-- | root | wait/io/file/myisam/dfile | 26776 | 746.70 ms | 27.89 us | 308.79 ms |
-- | root | wait/io/file/myisam/kfile | 7126 | 462.66 ms | 64.93 us | 88.76 ms |
-- | root | wait/io/file/sql/dbopt | 179 | 137.58 ms | 768.59 us | 15.46 ms |
-- | root | wait/io/file/csv/metadata | 8 | 86.60 ms | 10.82 ms | 50.32 ms |
-- | root | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 798080 | 66.46 ms | 82.94 ns | 161.03 us |
-- | root | wait/io/file/sql/binlog | 19 | 49.11 ms | 2.58 ms | 9.40 ms |
-- | root | wait/io/file/sql/misc | 26 | 22.38 ms | 860.80 us | 15.30 ms |
-- | root | wait/io/file/csv/data | 4 | 297.46 us | 74.37 us | 111.93 us |
-- | root | wait/synch/rwlock/sql/MDL_lock::rwlock | 944 | 287.86 us | 304.62 ns | 874.64 ns |
-- | root | wait/io/file/archive/data | 4 | 82.71 us | 20.68 us | 40.74 us |
-- | root | wait/synch/mutex/myisam/MYISAM_SHARE::intern_lock | 60 | 12.21 us | 203.20 ns | 512.72 ns |
-- | root | wait/synch/mutex/innodb/trx_mutex | 81 | 5.93 us | 73.14 ns | 252.59 ns |
-- +------+-----------------------------------------------------+--------+---------------+-------------+-------------+
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW waits_by_user_by_latency (
user,
event,
total,
total_latency,
avg_latency,
max_latency
) AS
SELECT IF(user IS NULL, 'background', user) AS user,
event_name AS event,
count_star AS total,
format_pico_time(sum_timer_wait) AS total_latency,
format_pico_time(avg_timer_wait) AS avg_latency,
format_pico_time(max_timer_wait) AS max_latency
FROM performance_schema.events_waits_summary_by_user_by_event_name
WHERE event_name != 'idle'
AND user IS NOT NULL
AND sum_timer_wait > 0
ORDER BY user, sum_timer_wait DESC;
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