RESOURCE_GROUPS
RESOURCE_GROUPS
表展示所有资源组 (resource group) 的信息,见使用资源管控 (Resource Control) 实现资源隔离。
USE information_schema;
DESC resource_groups;
+------------+-------------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+-------------+------+------+---------+-------+
| NAME | varchar(32) | NO | | NULL | |
| RU_PER_SEC | bigint(21) | YES | | NULL | |
| PRIORITY | varchar(6) | YES | | NULL | |
| BURSTABLE | varchar(3) | YES | | NULL | |
+------------+-------------+------+------+---------+-------+
3 rows in set (0.00 sec)
示例
SELECT * FROM information_schema.resource_groups; -- 查看资源组,TiDB 默认预置 `default` 资源组
+---------+------------+----------+-----------+
| NAME | RU_PER_SEC | PRIORITY | BURSTABLE |
+---------+------------+----------+-----------+
| default | UNLIMITED | MEDIUM | YES |
+---------+------------+----------+-----------+
CREATE RESOURCE GROUP rg1 RU_PER_SEC=1000; -- 创建资源组 `rg1`
Query OK, 0 rows affected (0.34 sec)
SHOW CREATE RESOURCE GROUP rg1; -- 显示 `rg1` 资源组的定义
+----------------+---------------------------------------------------------------+
| Resource_Group | Create Resource Group |
+----------------+---------------------------------------------------------------+
| rg1 | CREATE RESOURCE GROUP `rg1` RU_PER_SEC=1000 PRIORITY="MEDIUM" |
+----------------+---------------------------------------------------------------+
1 row in set (0.00 sec)
SELECT * FROM information_schema.resource_groups WHERE NAME = 'rg1'; -- 查看资源组 `rg1`
+------+------------+----------+-----------+-------------+
| NAME | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT |
+------+------------+----------+-----------+-------------+
| rg1 | 1000 | MEDIUM | NO | NULL |
+------+------------+----------+-----------+-------------+
1 row in set (0.00 sec)
RESOURCE_GROUPS
表中列的含义如下:
NAME
:资源组名称。RU_PER_SEC
:资源组的回填速度,单位为每秒回填的 Request Unit (RU) 数量。PRIORITY
:任务在 TiKV 上处理的绝对优先级。不同的资源按照PRIORITY
的设置进行调度,PRIORITY
高的任务会被优先调度。如果资源组的PRIORITY
相同,则会根据RU_PER_SEC
的配置按比例调度。如果不指定PRIORITY
,资源组的默认优先级为MEDIUM
。BURSTABLE
:是否允许此资源组超额使用剩余的系统资源。