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This is an automated cherry-pick of pingcap#6409
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Signed-off-by: ti-chi-bot <[email protected]>
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wshwsh12 authored and ti-chi-bot committed Jul 6, 2021
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Expand Up @@ -825,8 +825,13 @@ 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`

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- 作用域:SESSION
- 默认值:0.8
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- 作用域:`INSTANCE`
- 默认值:`0.8`
>>>>>>> 47de91471 (Change tidb_memory_usage_alarm_ratio scope to instance (#6409))
- 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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