> ## 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.

# os_threads_* 会话设置

> 属于 os_threads_* 生成组的 ClickHouse 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 [源码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="os_threads_nice_value_materialized_view">
  ## os\_threads\_nice\_value\_materialized\_view
</div>

<SettingsInfoBlock type="Int32" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.9"},{"label": "0"},{"label": "新增设置。"}]}]} />

materialized view 线程的 Linux nice 值。值越小，CPU 优先级越高。

需要 CAP\_SYS\_NICE 能力，否则为空操作。

可能的值：-20 到 19。

<div id="os_threads_nice_value_query">
  ## os\_threads\_nice\_value\_query
</div>

**别名**: `os_thread_priority`

<SettingsInfoBlock type="Int32" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.9"},{"label": "0"},{"label": "新设置。"}]}]} />

查询处理线程的 Linux nice 值。值越低，CPU 优先级越高。

需要 `CAP_SYS_NICE` 能力，否则为空操作。

可能的值：-20 到 19。