> ## 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.

# compact_parts_* MergeTree 表设置

> ClickHouse compact_parts_* 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="compact_parts_max_bytes_to_buffer">
  ## compact\_parts\_max\_bytes\_to\_buffer
</div>

<SettingsInfoBlock type="UInt64" default_value="134217728" />

仅 ClickHouse Cloud 可用。compact parts 中单个
stripe 可写入的最大字节数

<div id="compact_parts_max_granules_to_buffer">
  ## compact\_parts\_max\_granules\_to\_buffer
</div>

<SettingsInfoBlock type="NonZeroUInt64" default_value="128" />

仅 ClickHouse Cloud 支持。compact parts 中单个
stripe 可写入的最大粒度数

<div id="compact_parts_merge_max_bytes_to_prefetch_part">
  ## compact\_parts\_merge\_max\_bytes\_to\_prefetch\_part
</div>

<SettingsInfoBlock type="UInt64" default_value="16777216" />

仅在 ClickHouse Cloud 中可用。在合并期间将 compact part 整体读入内存时的最大大小。