> ## 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.

# concurrent_part_removal_threshold_* MergeTree table settings

> ClickHouse MergeTree table settings in the concurrent_part_removal_threshold_* 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="concurrent_part_removal_threshold">
  concurrent\_part\_removal\_threshold
</h2>

<SettingsInfoBlock type="UInt64" default_value="100" />

Activate concurrent part removal (see 'max\_part\_removal\_threads') only if
the number of inactive data parts is at least this.

<h2 id="concurrent_part_removal_threshold_for_remote_disk">
  concurrent\_part\_removal\_threshold\_for\_remote\_disk
</h2>

<SettingsInfoBlock type="UInt64" default_value="16" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "16"},{"label": "New setting. Lower threshold to enter the concurrent part removal path when any part being removed is on a remote disk, where each removal is typically one network round-trip. The old value (100) matches the legacy `concurrent_part_removal_threshold` default, so older `compatibility` modes preserve the previous behavior."}]}]} />

Same as `concurrent_part_removal_threshold`, but used when at least one
part being removed is stored on a remote disk. The default is lower
because each part removal on remote storage typically requires a network
round-trip (e.g. one HTTP `DELETE` per part on object storage), so a
serial removal of even 100 parts can stall a `DROP TABLE` for tens of
seconds.