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/* Copyright (c) 2014, 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: 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.
*
* mysql> select * from schema_unused_indexes limit 5;
* +-------------------------+----------------------------------------+------------+
* | object_schema | object_name | index_name |
* +-------------------------+----------------------------------------+------------+
* | mem30_test__instruments | mysqlavailabilityadvisor$observedstate | PRIMARY |
* | mem30_test__test | compressme | PRIMARY |
* | mem30_test__test | compressmekeyblocksize | PRIMARY |
* | mem30_test__test | dontcompressme | PRIMARY |
* | mem30_test__test | round_robin_test | PRIMARY |
* +-------------------------+----------------------------------------+------------+
*
*/
CREATE OR REPLACE
ALGORITHM = MERGE
DEFINER = 'root'@'localhost'
SQL SECURITY INVOKER
VIEW schema_unused_indexes (
object_schema,
object_name,
index_name
) AS
SELECT object_schema,
object_name,
index_name
FROM performance_schema.table_io_waits_summary_by_index_usage
WHERE index_name IS NOT NULL
AND count_star = 0
AND object_schema != 'mysql'
ORDER BY object_schema, object_name;
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