> ## 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.

# enable_* MergeTree table settings

> ClickHouse MergeTree table settings in the enable_* generated group.

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
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

export const ExperimentalBadge = () => {
  return <div className="experimentalBadge">
            <div className="experimentalIcon">
            <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
                <path strokeWidth="1.25" d="M5.5 2H10.5" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M9.50015 2V6.19625L13.4283 12.7425C13.4738 12.8183 13.4985 12.9049 13.4996 12.9934C13.5008 13.0818 13.4785 13.169 13.435 13.246C13.3914 13.323 13.3283 13.3871 13.2519 13.4317C13.1755 13.4764 13.0886 13.4999 13.0002 13.5H3.00015C2.91164 13.5 2.8247 13.4766 2.74822 13.432C2.67174 13.3874 2.60847 13.3233 2.56487 13.2463C2.52126 13.1693 2.49889 13.082 2.50004 12.9935C2.50119 12.905 2.52582 12.8184 2.5714 12.7425L6.50015 6.19625V2" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M4.47656 9.56754C5.30344 9.41254 6.47656 9.47942 7.99969 10.25C10.0153 11.2707 11.4216 11.0569 12.2184 10.7282" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
            </svg>
        </div>
            Experimental feature. <u><a href="/docs/docs/beta-and-experimental-features#experimental-features">Learn more.</a></u>
        </div>;
};

These settings are available in [system.merge\_tree\_settings](/docs/reference/system-tables/merge_tree_settings) and are autogenerated from ClickHouse source.

<h2 id="enable_index_granularity_compression">
  enable\_index\_granularity\_compression
</h2>

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

Compress in memory values of index granularity if it is possible

<h2 id="enable_max_bytes_limit_for_min_age_to_force_merge">
  enable\_max\_bytes\_limit\_for\_min\_age\_to\_force\_merge
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.2"},{"label": "1"},{"label": "Limit part sizes even with min_age_to_force_merge_seconds by default"}]}, {"id": "row-2","items": [{"label": "25.1"},{"label": "0"},{"label": "Added new setting to limit max bytes for min_age_to_force_merge."}]}, {"id": "row-3","items": [{"label": "25.1"},{"label": "0"},{"label": "New setting"}]}]} />

If settings `min_age_to_force_merge_seconds` and
`min_age_to_force_merge_on_partition_only` should respect setting
`max_bytes_to_merge_at_max_space_in_pool`.

Possible values:

* `true`
* `false`

<h2 id="enable_mixed_granularity_parts">
  enable\_mixed\_granularity\_parts
</h2>

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

Enables or disables transitioning to control the granule size with the
`index_granularity_bytes` setting. Before version 19.11, there was only the
`index_granularity` setting for restricting granule size. The
`index_granularity_bytes` setting improves ClickHouse performance when
selecting data from tables with big rows (tens and hundreds of megabytes).
If you have tables with big rows, you can enable this setting for the tables
to improve the efficiency of `SELECT` queries.

<h2 id="enable_replacing_merge_with_cleanup_for_min_age_to_force_merge">
  enable\_replacing\_merge\_with\_cleanup\_for\_min\_age\_to\_force\_merge
</h2>

<ExperimentalBadge />

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.3"},{"label": "0"},{"label": "New setting to allow automatic cleanup merges for ReplacingMergeTree"}]}]} />

Whether to use CLEANUP merges for ReplacingMergeTree when merging partitions
down to a single part. Requires `allow_experimental_replacing_merge_with_cleanup`,
`min_age_to_force_merge_seconds` and `min_age_to_force_merge_on_partition_only`
to be enabled.

Possible values:

* `true`
* `false`

<h2 id="enable_the_endpoint_id_with_zookeeper_name_prefix">
  enable\_the\_endpoint\_id\_with\_zookeeper\_name\_prefix
</h2>

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

Enable the endpoint id with zookeeper name prefix for the replicated merge
tree table.

<h2 id="enable_vertical_merge_algorithm">
  enable\_vertical\_merge\_algorithm
</h2>

<SettingsInfoBlock type="UInt64" default_value="1" />

Enable usage of Vertical merge algorithm.