> ## 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.

# async_* 会话设置

> ClickHouse 在 async_* 自动生成组中的会话设置。

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](/docs/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="async_query_sending_for_remote">
  ## async\_query\_sending\_for\_remote
</div>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "23.3"},{"label": "1"},{"label": "创建连接并跨分片异步发送查询"}]}]} />

在执行远程查询时，启用异步创建连接和发送查询。

默认启用。

<div id="async_socket_for_remote">
  ## async\_socket\_for\_remote
</div>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "21.5"},{"label": "1"},{"label": "修复所有问题后，再次默认启用远程查询的套接字异步读取"}]}, {"id": "row-2","items": [{"label": "21.3"},{"label": "0"},{"label": "由于一些问题，关闭远程查询的套接字异步读取"}]}]} />

执行远程查询时，启用从套接字异步读取。

默认启用。