mysql.innodb_index_stats
The mysql.innodb_index_stats table stores data related to particular InnoDB Persistent Statistics, and contains multiple rows for each index.
This table, along with the related mysql.innodb_table_stats table, can be manually updated in order to force or test differing query optimization plans. After updating, FLUSH TABLE innodb_index_stats is required to load the changes.
mysql.innodb_index_stats is not replicated, although any ANALYZE TABLE statements on the table will be by default..
It contains the following fields:
| Field | Type | Null | Key | Default | Description |
|---|---|---|---|---|---|
database_name | varchar(64) | NO | PRI | NULL | Database name. |
table_name | varchar(64) | NO | PRI | NULL | Table, partition or subpartition name. |
index_name | varchar(64) | NO | PRI | NULL | Index name. |
last_update | timestamp | NO | current_timestamp() | Time that this row was last updated. | |
stat_name | varchar(64) | NO | PRI | NULL | Statistic name. |
stat_value | bigint(20) unsigned | NO | NULL | Estimated statistic value. | |
sample_size | bigint(20) unsigned | YES | NULL | Number of pages sampled for the estimated statistic value. | |
stat_description | varchar(1024) | NO | NULL | Statistic description. |
Example
SELECT * FROM mysql.innodb_index_stats\G
*************************** 1. row ***************************
database_name: mysql
table_name: gtid_slave_pos
index_name: PRIMARY
last_update: 2017-08-19 20:38:34
stat_name: n_diff_pfx01
stat_value: 0
sample_size: 1
stat_description: domain_id
*************************** 2. row ***************************
database_name: mysql
table_name: gtid_slave_pos
index_name: PRIMARY
last_update: 2017-08-19 20:38:34
stat_name: n_diff_pfx02
stat_value: 0
sample_size: 1
stat_description: domain_id,sub_id
*************************** 3. row ***************************
database_name: mysql
table_name: gtid_slave_pos
index_name: PRIMARY
last_update: 2017-08-19 20:38:34
stat_name: n_leaf_pages
stat_value: 1
sample_size: NULL
stat_description: Number of leaf pages in the index
*************************** 4. row ***************************
database_name: mysql
table_name: gtid_slave_pos
index_name: PRIMARY
last_update: 2017-08-19 20:38:34
stat_name: size
stat_value: 1
sample_size: NULL
stat_description: Number of pages in the index
*************************** 5. row ***************************
database_name: test
table_name: ft
index_name: FTS_DOC_ID_INDEX
last_update: 2017-09-15 12:58:39
stat_name: n_diff_pfx01
stat_value: 0
sample_size: 1
stat_description: FTS_DOC_ID
*************************** 6. row ***************************
database_name: test
table_name: ft
index_name: FTS_DOC_ID_INDEX
last_update: 2017-09-15 12:58:39
stat_name: n_leaf_pages
stat_value: 1
sample_size: NULL
stat_description: Number of leaf pages in the index
...
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