> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# memory_overcommit_ratio_denominator_* 会话设置

> ClickHouse 中 memory_overcommit_ratio_denominator_* 自动生成分组下的会话设置。

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>类型</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>默认值</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          无需重启即可更改
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

这些设置可在 [system.settings](/docs/zh/reference/system-tables/settings) 中查看，并由 [源代码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="memory_overcommit_ratio_denominator">
  ## memory\_overcommit\_ratio\_denominator
</div>

<SettingsInfoBlock type="UInt64" default_value="1073741824" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "22.5"},{"label": "1073741824"},{"label": "默认启用内存 overcommit 功能"}]}]} />

它表示在全局层面达到硬限制时的软内存限制。
此值用于计算查询的 overcommit 比率。
值为 0 表示跳过该查询。
有关[内存 overcommit](/docs/zh/concepts/features/configuration/settings/memory-overcommit)的更多信息，请参阅相关文档。

<div id="memory_overcommit_ratio_denominator_for_user">
  ## memory\_overcommit\_ratio\_denominator\_for\_user
</div>

<SettingsInfoBlock type="UInt64" default_value="1073741824" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "22.5"},{"label": "1073741824"},{"label": "默认启用内存 overcommit 功能"}]}]} />

它表示在用户级别达到硬限制时的软内存限制。
该值用于计算查询的 overcommit 比率。
值为 0 表示跳过该查询。
有关内存 overcommit 的更多信息，请参阅[内存 overcommit](/docs/zh/concepts/features/configuration/settings/memory-overcommit)。