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
- TableNameList
- TableName
DropStatsStmt ::=
'DROP' 'STATS' TableNameList
TableNameList ::=
TableName ( ',' TableName )*
TableName ::=
Identifier ('.' Identifier)?
示例
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 兼容性
该语句是 TiDB 对 MySQL 语法的扩展。