> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-8c05c8a2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Contains a list of all ReplicatedMergeTree engine specific settings, their current and default values along with descriptions. You may change any of them in SETTINGS section in CREATE query. 

# system.replicated_merge_tree_settings

<h2 id="description">
  Description
</h2>

Contains a list of all ReplicatedMergeTree engine specific settings, their current and default values along with descriptions. You may change any of them in SETTINGS section in CREATE query.

<h2 id="columns">
  Columns
</h2>

* `name` ([String](/reference/data-types/index)) — Setting name.
* `value` ([String](/reference/data-types/index)) — Setting value.
* `default` ([String](/reference/data-types/index)) — Setting default value.
* `changed` ([UInt8](/reference/data-types/index)) — 1 if the setting was explicitly defined in the config or explicitly changed.
* `description` ([String](/reference/data-types/index)) — Setting description.
* `min` ([Nullable(String)](/reference/data-types/index)) — Minimum value of the setting, if any is set via constraints. If the setting has no minimum value, contains NULL.
* `max` ([Nullable(String)](/reference/data-types/index)) — Maximum value of the setting, if any is set via constraints. If the setting has no maximum value, contains NULL.
* `disallowed_values` ([Array(String)](/reference/data-types/index)) — List of disallowed values
* `readonly` ([UInt8](/reference/data-types/index)) — Shows whether the current user can change the setting: 0 — Current user can change the setting, 1 — Current user can't change the setting.
* `type` ([String](/reference/data-types/index)) — Setting type (implementation specific string value).
* `is_obsolete` ([UInt8](/reference/data-types/index)) — Shows whether a setting is obsolete.
* `tier` ([Enum8('Production' = 0, 'Obsolete' = 4, 'Experimental' = 8, 'Beta' = 12)](/reference/data-types/index)) —
  Support level for this feature. ClickHouse features are organized in tiers, varying depending on the current status of their
  development and the expectations one might have when using them:

- PRODUCTION: The feature is stable, safe to use and does not have issues interacting with other PRODUCTION features.
- BETA: The feature is stable and safe. The outcome of using it together with other features is unknown and correctness is not guaranteed. Testing and reports are welcome.
- EXPERIMENTAL: The feature is under development. Only intended for developers and ClickHouse enthusiasts. The feature might or might not work and could be removed at any time.
- OBSOLETE: No longer supported. Either it is already removed or it will be removed in future releases.