-- Copyright (c) 2014, 2019, 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, 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: statements_with_runtimes_in_95th_percentile
--
-- List all statements whose average runtime, in microseconds, is in the top 95th percentile.
-- 
-- mysql> select * from statements_with_runtimes_in_95th_percentile limit 5;
-- +-------------------------------------------------------------------+------+-----------+------------+-----------+------------+---------------+-------------+-------------+-----------+---------------+---------------+-------------------+---------------------+---------------------+----------------------------------+
-- | query                                                             | db   | full_scan | exec_count | err_count | warn_count | total_latency | max_latency | avg_latency | rows_sent | rows_sent_avg | rows_examined | rows_examined_avg | FIRST_SEEN          | LAST_SEEN           | digest                           |
-- +-------------------------------------------------------------------+------+-----------+------------+-----------+------------+---------------+-------------+-------------+-----------+---------------+---------------+-------------------+---------------------+---------------------+----------------------------------+
-- | SELECT `e` . `round_robin_bin` ...  `timestamp` = `maxes` . `ts`  | mem  | *         |         14 |         0 |          0 | 43.96 s       | 6.69 s      | 3.14 s      |        11 |             1 |        253170 |             18084 | 2013-12-04 20:05:01 | 2013-12-04 20:06:34 | 29ba002bf039bb6439357a10134407de |
-- | SELECT `e` . `round_robin_bin` ...  `timestamp` = `maxes` . `ts`  | mem  | *         |          8 |         0 |          0 | 17.89 s       | 4.12 s      | 2.24 s      |         7 |             1 |        169534 |             21192 | 2013-12-04 20:04:54 | 2013-12-04 20:05:05 | 0b1c1f91e7e9e0ff91aa49d15f540793 |
-- | SELECT `e` . `round_robin_bin` ...  `timestamp` = `maxes` . `ts`  | mem  | *         |          1 |         0 |          0 | 2.22 s        | 2.22 s      | 2.22 s      |         1 |             1 |         40322 |             40322 | 2013-12-04 20:05:39 | 2013-12-04 20:05:39 | 07b27145c8f8a3779737df5032374833 |
-- | SELECT `e` . `round_robin_bin` ...  `timestamp` = `maxes` . `ts`  | mem  | *         |          1 |         0 |          0 | 1.97 s        | 1.97 s      | 1.97 s      |         1 |             1 |         40322 |             40322 | 2013-12-04 20:05:39 | 2013-12-04 20:05:39 | a07488137ea5c1bccf3e291c50bfd21f |
-- | SELECT `e` . `round_robin_bin` ...  `timestamp` = `maxes` . `ts`  | mem  | *         |          2 |         0 |          0 | 3.91 s        | 3.91 s      | 1.96 s      |         1 |             1 |         13126 |              6563 | 2013-12-04 20:05:04 | 2013-12-04 20:06:34 | b8bddc6566366dafc7e474f67096a93b |
-- +-------------------------------------------------------------------+------+-----------+------------+-----------+------------+---------------+-------------+-------------+-----------+---------------+---------------+-------------------+---------------------+---------------------+----------------------------------+
--

CREATE OR REPLACE
  ALGORITHM = MERGE
  DEFINER = 'mysql.sys'@'localhost'
  SQL SECURITY INVOKER 
VIEW statements_with_runtimes_in_95th_percentile (
  query,
  db,
  full_scan,
  exec_count,
  err_count,
  warn_count,
  total_latency,
  max_latency,
  avg_latency,
  rows_sent,
  rows_sent_avg,
  rows_examined,
  rows_examined_avg,
  first_seen,
  last_seen,
  digest
) AS
SELECT sys.format_statement(DIGEST_TEXT) AS query,
       SCHEMA_NAME as db,
       IF(SUM_NO_GOOD_INDEX_USED > 0 OR SUM_NO_INDEX_USED > 0, '*', '') AS full_scan,
       COUNT_STAR AS exec_count,
       SUM_ERRORS AS err_count,
       SUM_WARNINGS AS warn_count,
       sys.format_time(SUM_TIMER_WAIT) AS total_latency,
       sys.format_time(MAX_TIMER_WAIT) AS max_latency,
       sys.format_time(AVG_TIMER_WAIT) AS avg_latency,
       SUM_ROWS_SENT AS rows_sent,
       ROUND(IFNULL(SUM_ROWS_SENT / NULLIF(COUNT_STAR, 0), 0)) AS rows_sent_avg,
       SUM_ROWS_EXAMINED AS rows_examined,
       ROUND(IFNULL(SUM_ROWS_EXAMINED / NULLIF(COUNT_STAR, 0), 0)) AS rows_examined_avg,
       FIRST_SEEN AS first_seen,
       LAST_SEEN AS last_seen,
       DIGEST AS digest
  FROM performance_schema.events_statements_summary_by_digest stmts
  JOIN sys.x$ps_digest_95th_percentile_by_avg_us AS top_percentile
    ON ROUND(stmts.avg_timer_wait/1000000) >= top_percentile.avg_us
 ORDER BY AVG_TIMER_WAIT DESC;
