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remove system variable tidb_track_aggregate_memory_usage #5704

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Mar 19, 2021
Merged

remove system variable tidb_track_aggregate_memory_usage #5704

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10 changes: 0 additions & 10 deletions system-variables.md
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Expand Up @@ -1009,16 +1009,6 @@ set tidb_slow_log_threshold = 200;
- 默认值：0
- 这个变量用于限制 TiDB 同时向 TiKV 发送的请求的最大数量，0 表示没有限制。

### `tidb_track_aggregate_memory_usage` <span class="version-mark">从 v5.0.0-rc 版本开始引入</span>

> **警告：**
>
> `tidb_track_aggregate_memory_usage` 目前为实验特性，不建议在生产环境中使用。

- 作用域：SESSION | GLOBAL
- 默认值：OFF
- 这个变量表示是否追踪聚合函数的内存使用情况。当开启该功能时，聚合函数的内存使用情况会被统计，进而可能会造成整个 SQL 内存统计值超阈值 [`mem-quota-query`](/tidb-configuration-file.md#mem-quota-query)，然后被 [`oom-action`](/tidb-configuration-file.md#oom-action) 定义的行为影响。

### `tidb_txn_mode`

- 作用域：SESSION | GLOBAL
Expand Down