> ## 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_projections_* MergeTree table settings

> ClickHouse MergeTree table settings in the materialize_projections_* 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_projections_on_insert">
  materialize\_projections\_on\_insert
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.6"},{"label": "1"},{"label": "New setting"}]}]} />

When enabled, INSERTs create new parts with projections.
Otherwise, they can be created by explicit [MATERIALIZE PROJECTION](/docs/reference/statements/alter/projection#materialize-projection)
or during merges with [materialize\_projections\_on\_merge](/docs/reference/settings/merge-tree-settings/materialize-projections#materialize_projections_on_merge).

<h2 id="materialize_projections_on_merge">
  materialize\_projections\_on\_merge
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.6"},{"label": "0"},{"label": "New setting"}]}]} />

When enabled, a merge rebuilds a projection that is missing from all of its source parts (for example because they were
inserted with `materialize_projections_on_insert = 0`), so the merged part has the projection.

Merges still only combine parts that share the same set of projections. To backfill a projection to all existing parts,
use an explicit [MATERIALIZE PROJECTION](/docs/reference/statements/alter/projection#materialize-projection). Projections
are also created during INSERTs with [materialize\_projections\_on\_insert](/docs/reference/settings/merge-tree-settings/materialize-projections#materialize_projections_on_insert).