DROP STATS

DROP STATS 语句用于从当前所选定的数据库中删除选定表的统计信息。

语法图

DropStatsStmt

DROP STATS - 图1

TableNameList

DROP STATS - 图2

TableName

DROP STATS - 图3

1. DropStatsStmt ::=
2. 'DROP' 'STATS' TableNameList

4. TableNameList ::=
5. TableName ( ',' TableName )*

7. TableName ::=
8. Identifier ('.' Identifier)?

示例

1. CREATE TABLE t(a INT);

1. Query OK, 0 rows affected (0.01 sec)

1. SHOW STATS_META WHERE db_name='test' and table_name='t';

1. +---------+------------+----------------+---------------------+--------------+-----------+
2. | Db_name | Table_name | Partition_name | Update_time         | Modify_count | Row_count |
3. +---------+------------+----------------+---------------------+--------------+-----------+
4. | test    | t          |                | 2020-05-25 20:34:33 |            0 |         0 |
5. +---------+------------+----------------+---------------------+--------------+-----------+
6. 1 row in set (0.00 sec)

1. DROP STATS t;

1. Query OK, 0 rows affected (0.00 sec)

1. SHOW STATS_META WHERE db_name='test' and table_name='t';

1. Empty set (0.00 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅