MariaDB starting with 5.2

MariaDB 5.2 introduced the User Statistics feature.

Syntax

SHOW INDEX_STATISTICS

Description

The SHOW INDEX_STATISTICS statement was introduced in MariaDB 5.2 as part of the User Statistics feature. It was removed as a separate statement in MariaDB 10.1.1, but effectively replaced by the generic SHOW information_schema_table statement. The Information Schema INDEX_STATISTICS Table shows statistics on index usage and makes it possible to do such things as locating unused indexes and generating the commands to remove them.

The userstat system variable must be set to 1 to activate this feature. See the User Statistics and Information Schema INDEX_STATISTICS Table articles for more information.

Example

From MariaDB 10.0:

SHOW INDEX_STATISTICS;
+--------------+-------------------+------------+-----------+
| Table_schema | Table_name        | Index_name | Rows_read |
+--------------+-------------------+------------+-----------+
| test         | employees_example | PRIMARY    |         1 |
+--------------+-------------------+------------+-----------+

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