> ## 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.

# refresh_* MergeTree 表设置

> 属于 refresh_* 分组的 ClickHouse MergeTree 表设置。

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.merge\_tree\_settings](/docs/zh/reference/system-tables/merge_tree_settings) 中查看，且由 ClickHouse 源代码自动生成。

<div id="refresh_parts_interval">
  ## refresh\_parts\_interval
</div>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.4"},{"label": "0"},{"label": "新增设置"}]}]} />

如果该值大于 0，则会从底层文件系统刷新数据分区片段列表，以检查数据是否在底层已被更新。
只有当表位于只读磁盘上时才能设置此项 (这意味着这是一个只读副本，而数据由另一个副本写入) 。

<div id="refresh_statistics_interval">
  ## refresh\_statistics\_interval
</div>

<SettingsInfoBlock type="秒" default_value="300" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.2"},{"label": "300"},{"label": "启用统计信息缓存"}]}, {"id": "row-2","items": [{"label": "25.11"},{"label": "0"},{"label": "新增设置"}]}]} />

统计信息缓存的刷新间隔 (以秒为单位) 。如果设置为 0，则禁用刷新。