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ANALYZE TABLE

This statement updates the statistics that TiDB builds on tables and indexes. It is recommended to run ANALYZE TABLE after performing a large batch update or import of records, or when you notice that query execution plans are sub-optimal.

TiDB will also automatically update its statistics over time as it discovers that they are inconsistent with its own estimates.

Synopsis

AnalyzeTableStmt
ANALYZETABLETableNameListTableNamePARTITIONPartitionNameListINDEXIndexNameListINCREMENTALTABLETableNamePARTITIONPartitionNameListINDEXIndexNameListAnalyzeOptionListOpt
TableNameList
TableName,
TableName
Identifier.Identifier

Examples

mysql> CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL); Query OK, 0 rows affected (0.11 sec) mysql> INSERT INTO t1 (c1) VALUES (1),(2),(3),(4),(5); Query OK, 5 rows affected (0.03 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE t1 ADD INDEX (c1); Query OK, 0 rows affected (0.30 sec) mysql> EXPLAIN SELECT * FROM t1 WHERE c1 = 3; +-------------------+-------+------+-----------------------------------------------------------------+ | id | count | task | operator info | +-------------------+-------+------+-----------------------------------------------------------------+ | IndexReader_6 | 10.00 | root | index:IndexScan_5 | | └─IndexScan_5 | 10.00 | cop | table:t1, index:c1, range:[3,3], keep order:false, stats:pseudo | +-------------------+-------+------+-----------------------------------------------------------------+ 2 rows in set (0.00 sec) mysql> analyze table t1; Query OK, 0 rows affected (0.13 sec) mysql> EXPLAIN SELECT * FROM t1 WHERE c1 = 3; +-------------------+-------+------+---------------------------------------------------+ | id | count | task | operator info | +-------------------+-------+------+---------------------------------------------------+ | IndexReader_6 | 1.00 | root | index:IndexScan_5 | | └─IndexScan_5 | 1.00 | cop | table:t1, index:c1, range:[3,3], keep order:false | +-------------------+-------+------+---------------------------------------------------+ 2 rows in set (0.00 sec)

MySQL compatibility

This statement is syntactically similar with MySQL. However, ANALYZE TABLE may take significantly longer to execute on TiDB, as internally it operates in a different manner.

See also

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