> ## 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.

# temporary_files_* 会话设置

> ClickHouse 在 temporary_files_* 自动生成分组中的会话设置。

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="temporary_files_buffer_size">
  ## temporary\_files\_buffer\_size
</div>

<SettingsInfoBlock type="NonZeroUInt64" default_value="1048576" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.10"},{"label": "1048576"},{"label": "新增设置"}]}]} />

临时 File 写入器的缓冲区大小。缓冲区越大，系统调用越少，但内存消耗也会越多。

<div id="temporary_files_codec">
  ## temporary\_files\_codec
</div>

<SettingsInfoBlock type="String" default_value="LZ4" />

为在 disk 上进行排序和连接操作时使用的临时 File 设置压缩 codec。

可选值：

* LZ4 — 应用 [LZ4](https://en.wikipedia.org/wiki/LZ4_\(compression_algorithm\)) 压缩。
* NONE — 不应用压缩。