sql-plan-replayer: add description for PLAN REPLAYER CAPTURE REMOVE (…

…#17417) (#17426)

sql-plan-replayer.md

@@ -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;
@@ -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。