> ## 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.

# show_* 会话设置

> show_* 生成的组中的 ClickHouse 会话设置。

export const VersionHistory = ({rows = []}) => {
  if (rows.length === 0) {
    return null;
  }
  const headers = ["版本", "默认值", "注释"];
  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
  }}>
        版本历史
      </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
  }}>类型</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>默认值</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          无需重启即可更改
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

这些设置可在 [system.settings](/zh/reference/system-tables/settings) 中查看，并由 [源代码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

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

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

启用在系统表中显示数据湖目录的功能。

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

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

在 `SHOW PROCESSLIST` 查询输出中显示内部辅助进程。

内部进程包括字典重新加载、可刷新materialized view 重新加载、在 `SHOW ...` 查询中执行的辅助 `SELECT`，以及为处理损坏表而在内部执行的辅助 `CREATE DATABASE ...` 查询等。

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

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

启用后，会在系统表中显示 `MySQL` 和 `PostgreSQL` 数据库。

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

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

设置 `SHOW TABLE` 查询的显示方式。

可能的值：

* 0 — 显示的查询中不包含表 UUID。
* 1 — 显示的查询中包含表 UUID。