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sql-statement-drop-resource-group.md

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DROP RESOURCE GROUP
TiDB 数据库中 DROP RESOURCE GROUP 的使用概况。

DROP RESOURCE GROUP

DROP RESOURCE GROUP 语句用于在当前所选数据库中删除资源组。

语法图

DropResourceGroupStmt ::=
    "DROP" "RESOURCE" "GROUP" IfExists ResourceGroupName

IfExists ::=
    ('IF' 'EXISTS')?

ResourceGroupName ::=
    Identifier
|   "DEFAULT"

注意:

  • DROP RESOURCE GROUP 语句只能在全局变量 tidb_enable_resource_control 设置为 ON 时才能执行。
  • default 资源组为系统保留的资源组,不支持删除。

示例

删除名为 rg1 的资源组:

DROP RESOURCE GROUP IF EXISTS rg1;
Query OK, 0 rows affected (0.22 sec)
CREATE RESOURCE GROUP IF NOT EXISTS rg1 RU_PER_SEC = 500 BURSTABLE;
Query OK, 0 rows affected (0.08 sec)
SELECT * FROM information_schema.resource_groups WHERE NAME ='rg1';
+------+------------+----------+-----------+-------------+
| NAME | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT |
+------+------------+----------+-----------+-------------+
| rg1  | 500        | MEDIUM   | YES       | NULL        |
+------+------------+----------+-----------+-------------+
1 row in set (0.01 sec)
DROP RESOURCE GROUP IF EXISTS rg1;
Query OK, 1 rows affected (0.09 sec)
SELECT * FROM information_schema.resource_groups WHERE NAME ='rg1';
Empty set (0.00 sec)

MySQL 兼容性

MySQL 也支持 DROP RESOURCE GROUP,但 TiDB 不支持 FORCE 参数。

另请参阅