mysql.index_stats Table
The mysql.index_stats table is one of three tables storing data used for Engine-independent table statistics. The others are mysql.column_stats and mysql.table_stats.
MariaDB starting with 10.4
In MariaDB 10.4 and later, this table uses the Aria storage engine.
MariaDB until 10.3
In MariaDB 10.3 and before, this table uses the MyISAM storage engine.
The mysql.index_stats table contains the following fields:
| Field | Type | Null | Key | Default | Description |
|---|---|---|---|---|---|
db_name | varchar(64) | NO | PRI | NULL | Database the table is in. |
table_name | varchar(64) | NO | PRI | NULL | Table name |
index_name | varchar(64) | NO | PRI | NULL | Name of the index |
prefix_arity | int(11) unsigned | NO | PRI | NULL | Index prefix length. 1 for the first keypart, 2 for the first two, and so on. InnoDB's extended keys are supported. |
avg_frequency | decimal(12,4) | YES | NULL | Average number of records one will find for given values of (keypart1, keypart2, ..), provided the values will be found in the table. |
It is possible to manually update the table. See Manual updates to statistics tables for details.
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