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

# show_* session settings

> ClickHouse session settings in the show_* generated group.

export const VersionHistory = ({rows = []}) => {
  if (rows.length === 0) {
    return null;
  }
  const headers = ["Version", "Default value", "Comment"];
  const border = "1px solid rgba(128, 128, 128, 0.3)";
  const cell = {
    border,
    padding: "0.25rem 0.5rem",
    textAlign: "start",
    verticalAlign: "top"
  };
  return <details className="not-prose" style={{
    border,
    borderRadius: "0.5rem",
    margin: "0.5rem 0",
    padding: "0.5rem 0.75rem",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <summary style={{
    cursor: "pointer",
    fontWeight: 600,
    opacity: 0.72
  }}>
        Version history
      </summary>
      <table style={{
    borderCollapse: "collapse",
    width: "100%",
    margin: "0.5rem 0 0"
  }}>
        <thead>
          <tr>
            {headers.map(header => <th key={header} style={{
    ...cell,
    fontWeight: 600,
    opacity: 0.72
  }}>
                {header}
              </th>)}
          </tr>
        </thead>
        <tbody>
          {rows.map((row, row_index) => <tr key={row.id ?? row_index}>
              {(row.items ?? []).map((item, item_index) => <td key={item_index} style={{
    ...cell,
    overflowWrap: "anywhere"
  }}>
                  {item?.label}
                </td>)}
            </tr>)}
        </tbody>
      </table>
    </details>;
};

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](/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="show_data_lake_catalogs_in_system_tables">
  show\_data\_lake\_catalogs\_in\_system\_tables
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.8"},{"label": "1"},{"label": "New setting"}]}, {"id": "row-2","items": [{"label": "25.10"},{"label": "0"},{"label": "Disable catalogs in system tables by default"}]}]} />

Enables showing data lake catalogs in system tables.

<h2 id="show_processlist_include_internal">
  show\_processlist\_include\_internal
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.11"},{"label": "1"},{"label": "New setting."}]}]} />

Show internal auxiliary processes in the `SHOW PROCESSLIST` query output.

Internal processes include dictionary reloads, refreshable materialized view reloads, auxiliary `SELECT`s executed in `SHOW ...` queries, auxiliary `CREATE DATABASE ...` queries executed internally to accommodate broken tables and more.

<h2 id="show_remote_databases_in_system_tables">
  show\_remote\_databases\_in\_system\_tables
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.7"},{"label": "1"},{"label": "New setting to control whether `MySQL` and `PostgreSQL` databases are shown in `system.tables`, `system.columns` and `system.completions`."}]}, {"id": "row-2","items": [{"label": "26.2"},{"label": "1"},{"label": "New setting to control whether `MySQL` and `PostgreSQL` databases are shown in `system.tables`, `system.columns` and `system.completions`."}]}]} />

Enables showing `MySQL` and `PostgreSQL` databases in system tables.

<h2 id="show_table_uuid_in_table_create_query_if_not_nil">
  show\_table\_uuid\_in\_table\_create\_query\_if\_not\_nil
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "20.7"},{"label": "0"},{"label": "Stop showing  UID of the table in its CREATE query for Engine=Atomic"}]}]} />

Sets the `SHOW TABLE` query display.

Possible values:

* 0 — The query will be displayed without table UUID.
* 1 — The query will be displayed with table UUID.