> ## 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.

# merge_tree_* MergeTree 表设置

> ClickHouse 在 merge_tree_* 生成组中的 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="merge_tree_clear_old_broken_detached_parts_ttl_timeout_seconds">
  ## merge\_tree\_clear\_old\_broken\_detached\_parts\_ttl\_timeout\_seconds
</div>

<SettingsInfoBlock type="UInt64" default_value="2592000" />

已废弃设置，不起任何作用。

<div id="merge_tree_clear_old_parts_interval_seconds">
  ## merge\_tree\_clear\_old\_parts\_interval\_seconds
</div>

<SettingsInfoBlock type="UInt64" default_value="1" />

设置 ClickHouse 清理旧
parts、WAL 和变更的执行间隔 (以秒为单位) 。

可选值：

* 任意正整数。

<div id="merge_tree_clear_old_temporary_directories_interval_seconds">
  ## merge\_tree\_clear\_old\_temporary\_directories\_interval\_seconds
</div>

<SettingsInfoBlock type="UInt64" default_value="60" />

设置 ClickHouse 清理旧临时目录的执行间隔，单位为秒。

可能的值：

* 任意正整数。

<div id="merge_tree_enable_clear_old_broken_detached">
  ## merge\_tree\_enable\_clear\_old\_broken\_detached
</div>

<SettingsInfoBlock type="UInt64" default_value="0" />

已废弃设置，无任何作用。