Update docs for base64 encoding of password and kill auto analyze (#7896)

statistics.md

@@ -331,7 +331,33 @@ When the ratio of the number of modified rows to the total number of rows of `tb
 >
 > Currently, the automatic update does not record the configuration items input at manual `ANALYZE`. Therefore, when you use the `WITH` syntax to control the collecting behavior of `ANALYZE`, you need to manually set scheduled tasks to collect statistics.
 
-Before v5.0, when you execute a query, TiDB collects feedback with `feedback-probability` and updates the histogram and Count-Min Sketch based on the feedback. **Since v5.0, this feature is disabled by default, and it is not recommended to enable this feature.**
+Before TiDB v5.0, when you execute a query, TiDB collects feedback with `feedback-probability` and updates the histogram and Count-Min Sketch based on the feedback. **Since v5.0, this feature is disabled by default, and it is not recommended to enable this feature.**
+
+Since TiDB v6.0, TiDB supports using the `KILL` statement to terminate an `ANALYZE` task running in the background. If you find that an `ANALYZE` task running in the background consumes a lot of resources and affects your application, you can terminate the `ANALYZE` task by taking the following steps:
+
+1. Execute the following SQL statement to get the TiDB instance address and the `ID` of the background `ANALYZE` task:
+
+    {{< copyable "sql" >}}
+
+    ```sql
+    SELECT ci.instance as instance, cp.id as id FROM information_schema.cluster_info ci, information_schema.cluster_processlist cp WHERE ci.status_address = cp.instance and ci.type = 'tidb' and cp.info like 'analyze table %' and cp.user = '' and cp.host = '';
+    ```
+
+    If there is no result, no `ANALYZE` task is running in the background.
+
+2. Use a client to connect to the TiDB instance where the background `ANALYZE` task is running, and then execute the following `KILL` statement:
+
+    {{< copyable "sql" >}}
+
+    ```sql
+    KILL TIDB ${id};
+    ```
+
+    `${id}` is the `ID` of the background `ANALYZE` task obtained in the previous step.
+
+    > **Note:**
+    >
+    > The above `KILL` statement only works on a TiDB instance that is executing a background `ANALYZE` task. Therefore, you must use a client to connect to that TiDB instance first. If you use a client to connect to another TiDB instance, or if there is a proxy between the client and TiDB, the `KILL` statement cannot terminate the background `ANALYZE` task. For more information, see [`KILL [TIDB]`](/sql-statements/sql-statement-kill.md).
 
 ### Control `ANALYZE` concurrency
 

tidb-lightning/tidb-lightning-configuration.md

@@ -262,6 +262,7 @@ trim-last-separator = false
 host = "172.16.31.1"
 port = 4000
 user = "root"
+# Configure the password to connect to TiDB. The password can either be plaintext or Base64 encoded.
 password = ""
 # Table schema information is fetched from TiDB via this status-port.
 status-port = 10080
@@ -440,7 +441,7 @@ min-available-ratio = 0.05
 | --tidb-port *port* | TiDB server port (default = 4000) | `tidb.port` |
 | --tidb-status *port* | TiDB status port (default = 10080) | `tidb.status-port` |
 | --tidb-user *user* | User name to connect to TiDB | `tidb.user` |
-| --tidb-password *password* | Password to connect to TiDB | `tidb.password` |
+| --tidb-password *password* | Password to connect to TiDB. The password can either be plaintext or Base64 encoded. | `tidb.password` |
 | --no-schema | Ignore schema files, get schema directly from TiDB | `mydumper.no-schema` |
 | --enable-checkpoint *bool* | Whether to enable checkpoints (default = true) | `checkpoint.enable` |
 | --analyze *level* | Analyze tables after importing. Available values are "required", "optional" (default value), and "off" | `post-restore.analyze` |