> ## 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.

# compatibility_* session settings

> ClickHouse session settings in the compatibility_* 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.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="compatibility">
  compatibility
</h2>

The `compatibility` setting causes ClickHouse to use the default settings of a previous version of ClickHouse, where the previous version is provided as the setting.

If settings are set to non-default values, then those settings are honored (only settings that have not been modified are affected by the `compatibility` setting).

This setting takes a ClickHouse version number as a string, like `22.3`, `22.8`. An empty value means that this setting is disabled.

Disabled by default.

<Note>
  In ClickHouse Cloud, the service-level default compatibility setting must be set by ClickHouse Cloud support. Please [open a case](https://clickhouse.cloud/support) to have it set.
  However, the compatibility setting can be overridden at the user, role, profile, query, or session level using standard ClickHouse setting mechanisms such as `SET compatibility = '22.3'` in a session or `SETTINGS compatibility = '22.3'` in a query.
</Note>

<h2 id="compatibility_s3_presigned_url_query_in_path">
  compatibility\_s3\_presigned\_url\_query\_in\_path
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.12"},{"label": "0"},{"label": "New setting."}]}]} />

Compatibility: when enabled, folds pre-signed URL query parameters (e.g. X-Amz-\*) into the S3 key (legacy behavior),
so '?' acts as a wildcard in the path. When disabled (default), pre-signed URL query parameters are kept in the URL query
to avoid interpreting '?' as a wildcard.