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

# database_replicated_* session settings

> ClickHouse session settings in the database_replicated_* 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="database_replicated_allow_explicit_uuid">
  database\_replicated\_allow\_explicit\_uuid
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.9"},{"label": "0"},{"label": "Added a new setting to disallow explicitly specifying table UUID"}]}]} />

0 - Don't allow to explicitly specify UUIDs for tables in Replicated databases. 1 - Allow. 2 - Allow, but ignore the specified UUID and generate a random one instead.

<h2 id="database_replicated_allow_heavy_create">
  database\_replicated\_allow\_heavy\_create
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.7"},{"label": "0"},{"label": "Long-running DDL queries (CREATE AS SELECT and POPULATE) for Replicated database engine was forbidden"}]}]} />

Allow long-running DDL queries (CREATE AS SELECT and POPULATE) in Replicated database engine. Note that it can block DDL queue for a long time.

<h2 id="database_replicated_allow_only_replicated_engine">
  database\_replicated\_allow\_only\_replicated\_engine
</h2>

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

Allow to create only Replicated tables in database with engine Replicated

Cloud default value: `1`.

<h2 id="database_replicated_allow_replicated_engine_arguments">
  database\_replicated\_allow\_replicated\_engine\_arguments
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.9"},{"label": "0"},{"label": "Don't allow explicit arguments by default"}]}]} />

0 - Don't allow to explicitly specify ZooKeeper path and replica name for \*MergeTree tables in Replicated databases. 1 - Allow. 2 - Allow, but ignore the specified path and use default one instead. 3 - Allow and don't log a warning.

<h2 id="database_replicated_always_detach_permanently">
  database\_replicated\_always\_detach\_permanently
</h2>

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

Execute DETACH TABLE as DETACH TABLE PERMANENTLY if database engine is Replicated

<h2 id="database_replicated_enforce_synchronous_settings">
  database\_replicated\_enforce\_synchronous\_settings
</h2>

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

Enforces synchronous waiting for some queries (see also database\_atomic\_wait\_for\_drop\_and\_detach\_synchronously, mutations\_sync, alter\_sync). Not recommended to enable these settings.

<h2 id="database_replicated_initial_query_timeout_sec">
  database\_replicated\_initial\_query\_timeout\_sec
</h2>

<SettingsInfoBlock type="UInt64" default_value="300" />

Sets how long initial DDL query should wait for Replicated database to process previous DDL queue entries in seconds.

Possible values:

* Positive integer.
* 0 — Unlimited.