title | summary | aliases | |
---|---|---|---|
DROP STATS |
TiDB 数据库中 DROP STATS 的使用概况。 |
|
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。
DropStatsStmt ::=
'DROP' 'STATS' TableName
TableName ::=
Identifier ('.' Identifier)?
{{< copyable "sql" >}}
CREATE TABLE t(a INT);
Query OK, 0 rows affected (0.01 sec)
{{< copyable "sql" >}}
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)
{{< copyable "sql" >}}
DROP STATS t;
Query OK, 0 rows affected (0.00 sec)
{{< copyable "sql" >}}
SHOW STATS_META WHERE db_name='test' and table_name='t';
Empty set (0.00 sec)
该语句是 TiDB 对 MySQL 语法的扩展。