63 lines
2.4 KiB
SQL
63 lines
2.4 KiB
SQL
-- Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; version 2 of the License.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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--
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-- View: schema_unused_indexes
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--
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-- Finds indexes that have had no events against them (and hence, no usage).
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--
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-- To trust whether the data from this view is representative of your workload,
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-- you should ensure that the server has been up for a representative amount of
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-- time before using it.
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--
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-- PRIMARY (key) indexes are ignored.
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--
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-- mysql> select * from schema_unused_indexes limit 5;
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-- +--------------------+---------------------+--------------------+
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-- | object_schema | object_name | index_name |
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-- +--------------------+---------------------+--------------------+
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-- | mem30__bean_config | plists | path |
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-- | mem30__config | group_selections | name |
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-- | mem30__config | notification_groups | name |
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-- | mem30__config | user_form_defaults | FKC1AEF1F9E7EE2CFB |
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-- | mem30__enterprise | whats_new_entries | entryId |
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-- +--------------------+---------------------+--------------------+
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--
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CREATE OR REPLACE
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ALGORITHM = MERGE
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DEFINER = 'mysql.sys'@'localhost'
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SQL SECURITY INVOKER
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VIEW schema_unused_indexes (
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object_schema,
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object_name,
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index_name
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) AS
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SELECT t.object_schema,
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t.object_name,
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t.index_name
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FROM performance_schema.table_io_waits_summary_by_index_usage t
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INNER JOIN information_schema.statistics s
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ON t.object_schema = s.table_schema
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AND t.object_name = s.table_name
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AND t.index_name = s.index_name
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WHERE t.index_name IS NOT NULL
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AND t.count_star = 0
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AND t.object_schema != 'mysql'
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AND t.index_name != 'PRIMARY'
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AND s.NON_UNIQUE = 1
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AND s.SEQ_IN_INDEX = 1
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ORDER BY object_schema, object_name;
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