Information Schema INDEX_STATISTICS Table
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.
This is part of the User Statistics feature, which is not enabled by default.
It contains the following columns:
| Field | Type | Notes |
|---|---|---|
TABLE_SCHEMA | VARCHAR(192) | The schema (database) name. |
TABLE_NAME | VARCHAR(192) | The table name. |
INDEX_NAME | VARCHAR(192) | The index name (as visible in SHOW CREATE TABLE). |
ROWS_READ | BIGINT(21) | The number of rows read from this index. |
QUERIES | BIGINT(21) | Incremented for each index the query is part of. This assists one to see how effective the index is. From MariaDB 11.5 |
Example
SELECT * FROM information_schema.INDEX_STATISTICS WHERE TABLE_NAME = "author"; +--------------+------------+------------+-----------+ | TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ | +--------------+------------+------------+-----------+ | books | author | by_name | 15 | +--------------+------------+------------+-----------+
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