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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: statements_with_sorting
--
-- Lists all normalized statements that have done sorts,
-- ordered by total_latency descending.
--
-- mysql> select * from statements_with_sorting limit 1\G
-- *************************** 1. row ***************************
-- query: SELECT * FROM `schema_object_o ... MA` , `information_schema` ...
-- db: sys
-- exec_count: 2
-- total_latency: 16.75 s
-- sort_merge_passes: 0
-- avg_sort_merges: 0
-- sorts_using_scans: 12
-- sort_using_range: 0
-- rows_sorted: 168
-- avg_rows_sorted: 84
-- first_seen: 2014-03-07 13:13:41
-- last_seen: 2014-03-07 13:13:48
-- digest: 54f9bd520f0bbf15db0c2ed93386bec9
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mariadb.sys'@'localhost'
SQL SECURITY INVOKER
VIEW statements_with_sorting (
query,
db,
exec_count,
total_latency,
sort_merge_passes,
avg_sort_merges,
sorts_using_scans,
sort_using_range,
rows_sorted,
avg_rows_sorted,
first_seen,
last_seen,
digest
) AS
SELECT sys.format_statement(DIGEST_TEXT) AS query,
SCHEMA_NAME db,
COUNT_STAR AS exec_count,
format_pico_time(SUM_TIMER_WAIT) AS total_latency,
SUM_SORT_MERGE_PASSES AS sort_merge_passes,
ROUND(IFNULL(SUM_SORT_MERGE_PASSES / NULLIF(COUNT_STAR, 0), 0)) AS avg_sort_merges,
SUM_SORT_SCAN AS sorts_using_scans,
SUM_SORT_RANGE AS sort_using_range,
SUM_SORT_ROWS AS rows_sorted,
ROUND(IFNULL(SUM_SORT_ROWS / NULLIF(COUNT_STAR, 0), 0)) AS avg_rows_sorted,
FIRST_SEEN as first_seen,
LAST_SEEN as last_seen,
DIGEST AS digest
FROM performance_schema.events_statements_summary_by_digest
WHERE SUM_SORT_ROWS > 0
ORDER BY SUM_TIMER_WAIT DESC;
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