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.
It is populated when the ANALYZE TABLE statement is run, although not by default. See Collecting Statistics with the ANALYZE TABLE Statement for details.
It is possible to manually update the table and, unlike most system tables, there are some scenarios where this could be useful. See Manual updates to statistics tables for details.
This table uses the Aria 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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