DROP STATS
The DROP STATS statement is used to delete the statistics of the selected table from the selected database.
Synopsis
- DropStatsStmt
- TableName
DropStatsStmt ::=
'DROP' 'STATS' TableName ("PARTITION" partition | "GLOBAL")? ( ',' TableName )*
TableName ::=
Identifier ('.' Identifier)?
Usage
The following statement deletes all statistics of TableName. If a partitioned table is specified, this statement deletes statistics of all partitions in this table as well as GlobalStats generated in dynamic pruning mode.
DROP STATS TableName
Query OK, 0 rows affected (0.00 sec)
The following statement only deletes statistics of the specified partitions in PartitionNameList.
DROP STATS TableName PARTITION PartitionNameList;
Query OK, 0 rows affected (0.00 sec)
The following statement only deletes GlobalStats generated in dynamic pruning mode of the specified table.
DROP STATS TableName GLOBAL;
Query OK, 0 rows affected (0.00 sec)
Examples
CREATE TABLE t(a INT);
Query OK, 0 rows affected (0.01 sec)
SHOW STATS_META WHERE db_name='test' and table_name='t';
+---------+------------+----------------+---------------------+--------------+-----------+
| Db_name | Table_name | Partition_name | Update_time | Modify_count | Row_count |
+---------+------------+----------------+---------------------+--------------+-----------+
| test | t | | 2020-05-25 20:34:33 | 0 | 0 |
+---------+------------+----------------+---------------------+--------------+-----------+
1 row in set (0.00 sec)
DROP STATS t;
Query OK, 0 rows affected (0.00 sec)
SHOW STATS_META WHERE db_name='test' and table_name='t';
Empty set (0.00 sec)
MySQL compatibility
This statement is a TiDB extension to MySQL syntax.