> ## 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 table settings

> ClickHouse MergeTree table settings in the materialize_* 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>;
};

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

<h2 id="materialize_skip_indexes_on_merge">
  materialize\_skip\_indexes\_on\_merge
</h2>

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

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

When enabled, merges build and store skip indices for new parts.
Otherwise they can be created/stored by explicit [MATERIALIZE INDEX](/docs/reference/statements/alter/skipping-index#materialize-index)
or [during INSERTs](/docs/reference/settings/session-settings#materialize_skip_indexes_on_insert).

See also [exclude\_materialize\_skip\_indexes\_on\_merge](/docs/reference/settings/merge-tree-settings/exclude#exclude_materialize_skip_indexes_on_merge) for more fine-grained control.

<h2 id="materialize_statistics_on_merge">
  materialize\_statistics\_on\_merge
</h2>

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

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

When enabled, merges will build and store statistics for new parts.
Otherwise they can be created/stored by explicit [MATERIALIZE STATISTICS](/docs/reference/statements/alter/statistics)
or [during INSERTs](/docs/reference/settings/session-settings#materialize_statistics_on_insert)

<h2 id="materialize_ttl_recalculate_only">
  materialize\_ttl\_recalculate\_only
</h2>

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

Only recalculate ttl info when MATERIALIZE TTL