mysql.innodb_table_stats
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The mysql.innodb_table_stats table stores data related to InnoDB Persistent Statistics, and contains one row per table.
This table, along with the related mysql.innodb_index_stats table, can be manually updated in order to force or test differing query optimization plans. After updating, FLUSH TABLE innodb_table_stats is required to load the changes.
mysql.innodb_table_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. |
last_update | timestamp | NO | current_timestamp() | Time that this row was last updated. | |
n_rows | bigint(20) unsigned | NO | NULL | Number of rows in the table. | |
clustered_index_size | bigint(20) unsigned | NO | NULL | Size, in pages, of the primary index. | |
sum_of_other_index_sizes | bigint(20) unsigned | NO | NULL | Size, in pages, of non-primary indexes. |
Example
SELECT * FROM mysql.innodb_table_stats\G
*************************** 1. row ***************************
database_name: mysql
table_name: gtid_slave_pos
last_update: 2017-08-19 20:38:34
n_rows: 0
clustered_index_size: 1
sum_of_other_index_sizes: 0
*************************** 2. row ***************************
database_name: test
table_name: ft
last_update: 2017-09-15 12:58:39
n_rows: 0
clustered_index_size: 1
sum_of_other_index_sizes: 2
...
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