> ## 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.

# detach_* MergeTree table settings

> ClickHouse MergeTree table settings in the detach_* 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="detach_not_byte_identical_parts">
  detach\_not\_byte\_identical\_parts
</h2>

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

Enables or disables detaching a data part on a replica after a merge or a
mutation, if it is not byte-identical to data parts on other replicas. If
disabled, the data part is removed. Activate this setting if you want to
analyze such parts later.

The setting is applicable to `MergeTree` tables with enabled
[data replication](/docs/reference/engines/table-engines/mergetree-family/replacingmergetree).

Possible values:

* `0` — Parts are removed.
* `1` — Parts are detached.

<h2 id="detach_old_local_parts_when_cloning_replica">
  detach\_old\_local\_parts\_when\_cloning\_replica
</h2>

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

Do not remove old local parts when repairing lost replica.

Possible values:

* `true`
* `false`