> ## 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.

# min_bytes_* MergeTree table settings

> ClickHouse MergeTree table settings in the min_bytes_* 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="min_bytes_for_compact_part">
  min\_bytes\_for\_compact\_part
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

Obsolete setting, does nothing.

<h2 id="min_bytes_for_full_part_storage">
  min\_bytes\_for\_full\_part\_storage
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

Only available in ClickHouse Cloud. Minimal uncompressed size in bytes to
use full type of storage for data part instead of packed

<h2 id="min_bytes_for_wide_part">
  min\_bytes\_for\_wide\_part
</h2>

<SettingsInfoBlock type="UInt64" default_value="10485760" />

Minimum number of bytes/rows in a data part that can be stored in `Wide`
format. You can set one, both or none of these settings.

<h2 id="min_bytes_to_prewarm_caches">
  min\_bytes\_to\_prewarm\_caches
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.12"},{"label": "0"},{"label": "New setting"}]}]} />

Minimal size (uncompressed bytes) to prewarm mark cache and primary index cache
for new parts

<h2 id="min_bytes_to_rebalance_partition_over_jbod">
  min\_bytes\_to\_rebalance\_partition\_over\_jbod
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

Sets minimal amount of bytes to enable balancing when distributing new big
parts over volume disks [JBOD](https://en.wikipedia.org/wiki/Non-RAID_drive_architectures).

Possible values:

* Positive integer.
* `0` — Balancing is disabled.

**Usage**

The value of the `min_bytes_to_rebalance_partition_over_jbod` setting should
not be less than the value of the
[max\_bytes\_to\_merge\_at\_max\_space\_in\_pool](/docs/reference/settings/merge-tree-settings/max-bytes#max_bytes_to_merge_at_max_space_in_pool)
/ 1024. Otherwise, ClickHouse throws an exception.