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sql-plan-replayer: add description for PLAN REPLAYER CAPTURE REMOVE (#17417) #17425

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May 21, 2024
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sql-plan-replayer: add description for PLAN REPLAYER CAPTURE REMOVE (#17417) #17425

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time-and-fate May 21, 2024
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lilin90 May 21, 2024
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lilin90 May 21, 2024
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25 changes: 24 additions & 1 deletion sql-plan-replayer.md
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Expand Up @@ -240,7 +240,7 @@ mysql> SELECT * FROM mysql.plan_replayer_task;

### 查看 `PLAN REPLAYER CAPTURE` 抓取结果

当 `PLAN REPLAYER CAPTURE` 成功抓取到结果后，可以通过以下 SQL 语句查看用于下载的文件标识:
当 `PLAN REPLAYER CAPTURE` 成功抓取到结果后，可以通过以下 SQL 语句查看用于下载的文件标识：

```sql
mysql> SELECT * FROM mysql.plan_replayer_status;
Expand All @@ -260,6 +260,29 @@ mysql> SELECT * FROM mysql.plan_replayer_status;
>
> `PLAN REPLAYER CAPTURE` 的结果文件最多会在 TiDB 集群中保存一周，超时后 TiDB 会将其删除。

### 移除 `PLAN REPLAYER CAPTURE` 抓取任务

不再需要某个 `PLAN REPLAYER CAPTURE` 抓取任务后，你可以通过 `PLAN REPLAYER CAPTURE REMOVE` 语句将其移除。示例如下：

```sql
mysql> PLAN REPLAYER CAPTURE '077a87a576e42360c95530ccdac7a1771c4efba17619e26be50a4cfd967204a0' '4838af52c1e07fc8694761ad193d16a689b2128bc5ced9d13beb31ae27b370ce';
Query OK, 0 rows affected (0.01 sec)

mysql> SELECT * FROM mysql.plan_replayer_task;
+------------------------------------------------------------------+------------------------------------------------------------------+---------------------+
| sql_digest | plan_digest | update_time |
+------------------------------------------------------------------+------------------------------------------------------------------+---------------------+
| 077a87a576e42360c95530ccdac7a1771c4efba17619e26be50a4cfd967204a0 | 4838af52c1e07fc8694761ad193d16a689b2128bc5ced9d13beb31ae27b370ce | 2024-05-21 11:26:10 |
+------------------------------------------------------------------+------------------------------------------------------------------+---------------------+
1 row in set (0.01 sec)

mysql> PLAN REPLAYER CAPTURE REMOVE '077a87a576e42360c95530ccdac7a1771c4efba17619e26be50a4cfd967204a0' '4838af52c1e07fc8694761ad193d16a689b2128bc5ced9d13beb31ae27b370ce';
Query OK, 0 rows affected (0.01 sec)

mysql> SELECT * FROM mysql.plan_replayer_task;
Empty set (0.01 sec)
```

## 使用 `PLAN REPLAYER CONTINUOUS CAPTURE`

开启 `PLAN REPLAYER CONTINUOUS CAPTURE` 功能后，TiDB 将以 SQL DIGEST 和 PLAN DIGEST 为维度异步地将业务 SQL 语句以 `PLAN REPLAYER` 的方式进行记录，对于相同 DIGEST 的 SQL 语句与执行计划，`PLAN REPLAYER CONTINUOUS CAPTURE` 不会重复记录。
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