> ## 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_* MergeTree 表设置

> ClickHouse 在 merge_* 分组中的 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_total_max_bytes_to_prewarm_cache">
  ## merge\_total\_max\_bytes\_to\_prewarm\_cache
</div>

<SettingsInfoBlock type="UInt64" default_value="16106127360" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.1"},{"label": "16106127360"},{"label": "Cloud sync"}]}]} />

仅在 ClickHouse Cloud 中可用。表示在合并期间用于预热缓存的 parts 总大小上限。

<div id="merge_workload">
  ## merge\_workload
</div>

用于调节资源在合并与其他工作负载之间的分配和共享。指定的值将作为此表后台合并的 `workload` 设置值使用。如果未指定 (空字符串) ，则使用服务器级设置 `merge_workload`。

**另请参阅**

* [工作负载调度](/docs/zh/concepts/features/configuration/server-config/workload-scheduling)