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Update system-variables.md
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TomShawn authored Jul 6, 2021
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Expand Up @@ -923,8 +923,7 @@ v5.0 后,用户仍可以单独修改以上系统变量(会有废弃警告)
### `tidb_memory_usage_alarm_ratio`

- 作用域:`INSTANCE`
- 默认值:0.8

- 默认值:`0.8`
- TiDB 内存使用占总内存的比例超过一定阈值时会报警。该功能的详细介绍和使用方法可以参考 [`memory-usage-alarm-ratio`](/tidb-configuration-file.md#memory-usage-alarm-ratio-从-v409-版本开始引入)。
- 该变量的初始值可通过 [`memory-usage-alarm-ratio`](/tidb-configuration-file.md#memory-usage-alarm-ratio-从-v409-版本开始引入) 进行配置。

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