> ## 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.

# materialize_* MergeTree 表设置

> ClickHouse 在 materialize_* 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="materialize_skip_indexes_on_merge">
  ## materialize\_skip\_indexes\_on\_merge
</div>

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

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

启用后，合并操作会为新的 parts 构建并存储跳过索引。
否则，这些索引只能通过显式执行 [MATERIALIZE INDEX](/docs/zh/reference/statements/alter/skipping-index#materialize-index)
或 [在 INSERT 时](/docs/zh/reference/settings/session-settings#materialize_skip_indexes_on_insert) 创建/存储。

另请参见 [exclude\_materialize\_skip\_indexes\_on\_merge](/docs/zh/reference/settings/merge-tree-settings/exclude#exclude_materialize_skip_indexes_on_merge)，以进行更细粒度的控制。

<div id="materialize_statistics_on_merge">
  ## materialize\_statistics\_on\_merge
</div>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.1"},{"label": "1"},{"label": "新设置"}]}]} />

启用后，合并操作会为新的 parts 生成并存储统计信息。
否则，这些统计信息可通过显式执行 [MATERIALIZE STATISTICS](/docs/zh/reference/statements/alter/statistics)
或[在 INSERT 时](/docs/zh/reference/settings/session-settings#materialize_statistics_on_insert)创建/存储

<div id="materialize_ttl_recalculate_only">
  ## materialize\_ttl\_recalculate\_only
</div>

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

仅在执行 MATERIALIZE TTL 时重新计算 TTL 信息