mysql.index_stats Table
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MariaDB starting with 10.0.1
The mysql.index_stats table was introduced as part of the Engine-independent table statistics feature implemented in MariaDB 10.0.1.
The mysql.index_stats table is one of three tables storing data used for Engine-independent table statistics added in MariaDB 10.0.1. The others are mysql.column_stats and mysql.table_stats.
The 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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