> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-postgresql-tls-support.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# min_bytes_* MergeTree 表设置

> ClickHouse MergeTree 表设置，属于自动生成的 min_bytes_* 分组。

export const VersionHistory = ({rows = []}) => {
  if (rows.length === 0) {
    return null;
  }
  const headers = ["版本", "默认值", "注释"];
  const border = "1px solid rgba(128, 128, 128, 0.3)";
  const cell = {
    border,
    padding: "0.25rem 0.5rem",
    textAlign: "start",
    verticalAlign: "top"
  };
  return <details className="not-prose" style={{
    border,
    borderRadius: "0.5rem",
    margin: "0.5rem 0",
    padding: "0.5rem 0.75rem",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <summary style={{
    cursor: "pointer",
    fontWeight: 600,
    opacity: 0.72
  }}>
        版本历史
      </summary>
      <table style={{
    borderCollapse: "collapse",
    width: "100%",
    margin: "0.5rem 0 0"
  }}>
        <thead>
          <tr>
            {headers.map(header => <th key={header} style={{
    ...cell,
    fontWeight: 600,
    opacity: 0.72
  }}>
                {header}
              </th>)}
          </tr>
        </thead>
        <tbody>
          {rows.map((row, row_index) => <tr key={row.id ?? row_index}>
              {(row.items ?? []).map((item, item_index) => <td key={item_index} style={{
    ...cell,
    overflowWrap: "anywhere"
  }}>
                  {item?.label}
                </td>)}
            </tr>)}
        </tbody>
      </table>
    </details>;
};

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](/zh/reference/system-tables/merge_tree_settings) 中查看，且由 ClickHouse 源代码自动生成。

<div id="min_bytes_for_compact_part">
  ## min\_bytes\_for\_compact\_part
</div>

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

该设置已废弃，不起任何作用。

<div id="min_bytes_for_full_part_storage">
  ## min\_bytes\_for\_full\_part\_storage
</div>

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

仅在 ClickHouse Cloud 中可用。以字节为单位的最小未压缩大小，
用于让数据分区片段使用 Full 存储格式，而不是 packed

<div id="min_bytes_for_wide_part">
  ## min\_bytes\_for\_wide\_part
</div>

<SettingsInfoBlock type="UInt64" default_value="10485760" />

可按 `Wide`
格式存储的数据分区片段的最小字节数/行数。你可以只设置其中一个，也可以两个都设置，或者两个都不设置。

<div id="min_bytes_to_prewarm_caches">
  ## min\_bytes\_to\_prewarm\_caches
</div>

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

对新 parts 的标记缓存和主索引缓存进行预热所需的最小大小
(按未压缩字节数计)

<div id="min_bytes_to_rebalance_partition_over_jbod">
  ## min\_bytes\_to\_rebalance\_partition\_over\_jbod
</div>

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

设置在将新的大型
parts 分布到卷磁盘 [JBOD](https://en.wikipedia.org/wiki/Non-RAID_drive_architectures) 上时，启用均衡的最小字节数。

可能的值：

* 正整数。
* `0` — 禁用均衡。

**用法**

`min_bytes_to_rebalance_partition_over_jbod` 设置的值
不应小于
[max\_bytes\_to\_merge\_at\_max\_space\_in\_pool](/zh/reference/settings/merge-tree-settings/max-bytes#max_bytes_to_merge_at_max_space_in_pool)
的值除以 1024。否则，ClickHouse 会抛出异常。