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kill: improve kill's description (#7007) #7066

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Sep 2, 2021
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kill: improve kill's description (#7007) #7066

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`kill`: improve kill's description
en-jin19 Aug 27, 2021
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Update sql-statement-kill.md
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5 changes: 3 additions & 2 deletions sql-statements/sql-statement-kill.md
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Expand Up @@ -45,8 +45,9 @@ Query OK, 0 rows affected (0.00 sec)

## MySQL 兼容性

* 按照设计，`KILL TIDB` 语句默认与 MySQL 不兼容。负载均衡器后面通常放有多个 TiDB 服务器，这种默认不兼容有助于防止在错误的 TiDB 服务器上终止连接。
* `KILL TIDB` 语句是 TiDB 的扩展语法。如果正尝试终止的会话位于同一个 TiDB 服务器上，可在配置文件里设置 [`compatible-kill-query = true`](/tidb-configuration-file.md#compatible-kill-query)。
* 按照设计，`KILL` 语句默认与 MySQL 不兼容。负载均衡器后面通常放有多个 TiDB 服务器，这种默认不兼容有助于防止在错误的 TiDB 服务器上终止连接。
* 请**不要**在配置文件里设置 [`compatible-kill-query = true`](/tidb-configuration-file.md#compatible-kill-query)，**除非**你确定客户端将始终连接到同一个 TiDB 节点。这是因为当你在默认的 MySQL 客户端按下 <kbd>ctrl</kbd>+<kbd>c</kbd> 时，客户端会开启一个新连接，并在这个新连接中执行 `KILL` 语句。此时，如果客户端和 TiDB 中间有代理，新连接可能会被路由到其他的 TiDB 节点，从而错误地终止其他会话。
* `KILL TIDB` 语句是 TiDB 的扩展语法，其功能与 MySQL 命令 `KILL [CONNECTION|QUERY]` 和 MySQL 命令行的 <kbd>ctrl</kbd>+<kbd>c</kbd> 相同。在同一个 TiDB 节点上，你可以安全地使用 `KILL TIDB` 语句。

## 另请参阅

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