> ## 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.

# exclude_* MergeTree 表设置

> ClickHouse 在 exclude_* 生成分组中的 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 源码自动生成。

<div id="exclude_deleted_rows_for_part_size_in_merge">
  ## exclude\_deleted\_rows\_for\_part\_size\_in\_merge
</div>

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

如果启用，则在选择要合并的数据分区片段时，将使用数据分区片段的预计实际大小 (即排除通过 `DELETE FROM` 删除的那些行) 。请注意，此行为仅对在启用此设置后执行 `DELETE FROM` 所影响的数据分区片段生效。

可能的值：

* `true`
* `false`

**另请参阅**

* [load\_existing\_rows\_count\_for\_old\_parts](/docs/zh/reference/settings/merge-tree-settings/other#load_existing_rows_count_for_old_parts)
  设置

<div id="exclude_materialize_skip_indexes_on_merge">
  ## exclude\_materialize\_skip\_indexes\_on\_merge
</div>

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.10"},{"label": ""},{"label": "新设置。"}]}]} />

将给定的逗号分隔跳过索引列表排除，不在 合并 期间构建和存储。如果
[materialize\_skip\_indexes\_on\_merge](/docs/zh/reference/settings/merge-tree-settings/materialize#materialize_skip_indexes_on_merge) 为 false，则此设置不生效。

被排除的跳过索引仍会通过显式
[MATERIALIZE INDEX](/docs/zh/reference/statements/alter/skipping-index#materialize-index) 查询，或根据
[materialize\_skip\_indexes\_on\_insert](/docs/zh/reference/settings/session-settings#materialize_skip_indexes_on_insert)
session 设置在 INSERT 期间构建和存储。

示例：

```sql theme={null}
CREATE TABLE tab
(
a UInt64,
b UInt64,
INDEX idx_a a TYPE minmax,
INDEX idx_b b TYPE set(3)
)
ENGINE = MergeTree ORDER BY tuple() SETTINGS exclude_materialize_skip_indexes_on_merge = 'idx_a';

INSERT INTO tab SELECT number, number / 50 FROM numbers(100); -- setting has no effect on INSERTs

-- idx_a will be excluded from update during background or explicit merge via OPTIMIZE TABLE FINAL

-- can exclude multiple indexes by providing a list
ALTER TABLE tab MODIFY SETTING exclude_materialize_skip_indexes_on_merge = 'idx_a, idx_b';

-- default setting, no indexes excluded from being updated during merge
ALTER TABLE tab MODIFY SETTING exclude_materialize_skip_indexes_on_merge = '';
```