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docs: add tidb_enable_connection_event_log system variable #21811

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docs: add tidb_enable_connection_event_log system variable #21811

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10 changes: 10 additions & 0 deletions system-variables.md
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Expand Up @@ -1929,6 +1929,16 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 默认值：`ON`，在 v8.3.0 之前，默认值为 `OFF`。
- 这个变量用于控制是否开启 TiDB 对 `PREDICATE COLUMNS` 的收集。关闭该变量后，之前收集的 `PREDICATE COLUMNS` 会被清除。详情见[收集部分列的统计信息](/statistics.md#收集部分列的统计信息)。

### `tidb_enable_connection_event_log` <span class="version-mark">从 v8.5.8 和 v9.0.0 版本开始引入</span>

- 作用域：GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：布尔型
- 默认值：`OFF`
- 该变量用于控制 TiDB 是否将客户端成功登录和退出事件写入 TiDB 日志。
- 如果你的业务负载会频繁创建和关闭连接，开启该变量可能会产生大量日志。

### `tidb_enable_ddl` <span class="version-mark">从 v6.3.0 版本开始引入</span>

- 作用域：GLOBAL
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