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-- Copyright (c) 2014, 2025, 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 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: schema_index_statistics
--
-- Statistics around indexes.
--
-- Ordered by the total wait time descending - top indexes are most contended.
--
-- mysql> select * from schema_index_statistics limit 5;
-- +------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
-- | table_schema | table_name | index_name | rows_selected | select_latency | rows_inserted | insert_latency | rows_updated | update_latency | rows_deleted | delete_latency |
-- +------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
-- | mem | mysqlserver | PRIMARY | 6208 | 108.27 ms | 0 | 0 ps | 5470 | 1.47 s | 0 | 0 ps |
-- | mem | innodb | PRIMARY | 4666 | 76.27 ms | 0 | 0 ps | 4454 | 571.47 ms | 0 | 0 ps |
-- | mem | connection | PRIMARY | 1064 | 20.98 ms | 0 | 0 ps | 1064 | 457.30 ms | 0 | 0 ps |
-- | mem | environment | PRIMARY | 5566 | 151.17 ms | 0 | 0 ps | 694 | 252.57 ms | 0 | 0 ps |
-- | mem | querycache | PRIMARY | 1698 | 27.99 ms | 0 | 0 ps | 1698 | 371.72 ms | 0 | 0 ps |
-- +------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mysql.sys'@'localhost'
SQL SECURITY INVOKER
VIEW schema_index_statistics (
table_schema,
table_name,
index_name,
rows_selected,
select_latency,
rows_inserted,
insert_latency,
rows_updated,
update_latency,
rows_deleted,
delete_latency
) AS
SELECT OBJECT_SCHEMA AS table_schema,
OBJECT_NAME AS table_name,
INDEX_NAME as index_name,
COUNT_FETCH AS rows_selected,
format_pico_time(SUM_TIMER_FETCH) AS select_latency,
COUNT_INSERT AS rows_inserted,
format_pico_time(SUM_TIMER_INSERT) AS insert_latency,
COUNT_UPDATE AS rows_updated,
format_pico_time(SUM_TIMER_UPDATE) AS update_latency,
COUNT_DELETE AS rows_deleted,
format_pico_time(SUM_TIMER_DELETE) AS delete_latency
FROM performance_schema.table_io_waits_summary_by_index_usage
WHERE index_name IS NOT NULL
ORDER BY sum_timer_wait DESC;
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