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RUNAWAY_WATCHES
了解 INFORMATION_SCHEMA 表 `RUNAWAY_WATCHES`。

RUNAWAY_WATCHES

RUNAWAY_WATCHES 表展示资源消耗超出预期的查询 Runaway Queries 监控列表，见 Runaway Queries。

USE INFORMATION_SCHEMA;
DESC RUNAWAY_WATCHES;
+---------------------+--------------+------+------+---------+-------+
| Field               | Type         | Null | Key  | Default | Extra |
+---------------------+--------------+------+------+---------+-------+
| ID                  | bigint(64)   | NO   |      | NULL    |       |
| RESOURCE_GROUP_NAME | varchar(32)  | NO   |      | NULL    |       |
| START_TIME          | varchar(32)  | NO   |      | NULL    |       |
| END_TIME            | varchar(32)  | YES  |      | NULL    |       |
| WATCH               | varchar(12)  | NO   |      | NULL    |       |
| WATCH_TEXT          | text         | NO   |      | NULL    |       |
| SOURCE              | varchar(128) | NO   |      | NULL    |       |
| ACTION              | varchar(12)  | NO   |      | NULL    |       |
| RULE                | varchar(128) | NO   |      | NULL    |       |
+---------------------+--------------+------+------+---------+-------+
9 rows in set (0.00 sec)

示例

查询 Runaway Queries 识别名单：

SELECT * FROM INFORMATION_SCHEMA.RUNAWAY_WATCHES ORDER BY id\G

输出结果如下：

*************************** 1. row ***************************
                 ID: 1
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:20:48
           END_TIME: 2024-09-11 07:30:48
              WATCH: Exact
         WATCH_TEXT: select count(*) from `tpch1`.`supplier`
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: ProcessedKeys = 10000(100)
*************************** 2. row ***************************
                 ID: 2
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:20:51
           END_TIME: 2024-09-11 07:30:51
              WATCH: Exact
         WATCH_TEXT: select count(*) from `tpch1`.`partsupp`
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: RequestUnit = RRU:143.369959, WRU:0.000000, WaitDuration:0s(10)
*************************** 3. row ***************************
                 ID: 3
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:21:16
           END_TIME: 2024-09-11 07:31:16
              WATCH: Exact
         WATCH_TEXT: select sleep(2) from t
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: ElapsedTime = 2024-09-11T15:21:16+08:00(2024-09-11T15:21:16+08:00)
3 rows in set (0.00 sec)

添加一个识别项到资源组 rg1：

QUERY WATCH ADD RESOURCE GROUP rg1 SQL TEXT EXACT TO 'select * from sbtest.sbtest1';

再次查询 Runaway Queries 识别名单：

SELECT * FROM INFORMATION_SCHEMA.RUNAWAY_WATCHES\G

输出结果如下：

*************************** 1. row ***************************
                 ID: 1
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:20:48
           END_TIME: 2024-09-11 07:30:48
              WATCH: Exact
         WATCH_TEXT: select count(*) from `tpch1`.`supplier`
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: ProcessedKeys = 10000(100)
*************************** 2. row ***************************
                 ID: 2
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:20:51
           END_TIME: 2024-09-11 07:30:51
              WATCH: Exact
         WATCH_TEXT: select count(*) from `tpch1`.`partsupp`
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: RequestUnit = RRU:143.369959, WRU:0.000000, WaitDuration:0s(10)
*************************** 3. row ***************************
                 ID: 3
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:21:16
           END_TIME: 2024-09-11 07:31:16
              WATCH: Exact
         WATCH_TEXT: select sleep(2) from t
             SOURCE: 127.0.0.1:4000
             ACTION: Kill
               RULE: ElapsedTime = 2024-09-11T15:21:16+08:00(2024-09-11T15:21:16+08:00)
*************************** 4. row ***************************
                 ID: 4
RESOURCE_GROUP_NAME: default
         START_TIME: 2024-09-11 07:23:10
           END_TIME: UNLIMITED
              WATCH: Exact
         WATCH_TEXT: select * from sbtest.sbtest1
             SOURCE: manual
             ACTION: Kill
               RULE: None
3 row in set (0.00 sec)

RUNAWAY_WATCHES 表中列的含义如下：

  • ID：识别项 ID。
  • RESOURCE_GROUP_NAME：资源组名称。
  • START_TIME：开始时间。
  • END_TIME：结束时间。UNLIMITED 表示识别项的有效时间无限长。
  • WATCH：识别匹配类型，其值如下：
    • Plan 表示按照 Plan Digest 匹配，此时列 WATCH_TEXT 显示 Plan Digest。
    • Similar 表示按照 SQL Digest 匹配，此时列 WATCH_TEXT 显示 SQL Digest。
    • Exact 表示按照 SQL 文本匹配，此时列 WATCH_TEXT 显示 SQL 文本。
  • SOURCE：识别项来源，如果是被 QUERY_LIMIT 规则识别，则显示识别到的 TiDB IP；如果是手动添加，则显示 manual。
  • ACTION：识别后的对应操作。
  • RULE：识别规则。目前包括 ElapsedTime、ProcessedKeys 和 RequestUnit 这三种规则。格式为 ProcessedKeys = 666(10)，其中 666 为实际值，10 为阈值。