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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_unused_indexes
--
-- Finds indexes that have had no events against them (and hence, no usage).
--
-- To trust whether the data from this view is representative of your workload,
-- you should ensure that the server has been up for a representative amount of
-- time before using it.
--
-- PRIMARY (key) indexes are ignored.
--
-- mysql> select * from schema_unused_indexes limit 5;
-- +--------------------+---------------------+--------------------+
-- | object_schema | object_name | index_name |
-- +--------------------+---------------------+--------------------+
-- | mem30__bean_config | plists | path |
-- | mem30__config | group_selections | name |
-- | mem30__config | notification_groups | name |
-- | mem30__config | user_form_defaults | FKC1AEF1F9E7EE2CFB |
-- | mem30__enterprise | whats_new_entries | entryId |
-- +--------------------+---------------------+--------------------+
--
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'mysql.sys'@'localhost'
SQL SECURITY INVOKER
VIEW schema_unused_indexes (
object_schema,
object_name,
index_name
) AS
SELECT t.object_schema,
t.object_name,
t.index_name
FROM performance_schema.table_io_waits_summary_by_index_usage t
INNER JOIN information_schema.statistics s
ON t.object_schema = s.table_schema
AND t.object_name = s.table_name
AND t.index_name = s.index_name
WHERE t.index_name IS NOT NULL
AND t.count_star = 0
AND t.object_schema != 'mysql'
AND t.index_name != 'PRIMARY'
AND s.NON_UNIQUE = 1
AND s.SEQ_IN_INDEX = 1
ORDER BY object_schema, object_name;
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