> ## 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.

# logsql_* 会话设置

> ClickHouse 中属于自动生成的 logsql_* 分组的会话设置。

export const ExperimentalBadge = () => {
  return <a href="https://clickhouse.com/docs/reference/settings/beta-and-experimental-features#experimental-features" className="experimentalBadge">
            <div className="experimentalIcon">
            <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
                <path strokeWidth="1.25" d="M5.5 2H10.5" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M9.50015 2V6.19625L13.4283 12.7425C13.4738 12.8183 13.4985 12.9049 13.4996 12.9934C13.5008 13.0818 13.4785 13.169 13.435 13.246C13.3914 13.323 13.3283 13.3871 13.2519 13.4317C13.1755 13.4764 13.0886 13.4999 13.0002 13.5H3.00015C2.91164 13.5 2.8247 13.4766 2.74822 13.432C2.67174 13.3874 2.60847 13.3233 2.56487 13.2463C2.52126 13.1693 2.49889 13.082 2.50004 12.9935C2.50119 12.905 2.52582 12.8184 2.5714 12.7425L6.50015 6.19625V2" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
                <path strokeWidth="1.25" d="M4.47656 9.56754C5.30344 9.41254 6.47656 9.47942 7.99969 10.25C10.0153 11.2707 11.4216 11.0569 12.2184 10.7282" stroke="currentColor" strokeLinecap="round" strokeLinejoin="round" />
            </svg>
        </div>
            Experimental 功能
        </a>;
};

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

<h2 id="logsql_database">
  logsql\_database
</h2>

<ExperimentalBadge />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": ""},{"label": "新增设置，用于指定 'logsql' 方言所用日志表所在的数据库。"}]}]} />

指定 'logsql' 方言所用日志表所在的数据库。空字符串表示使用当前数据库。

<h2 id="logsql_message_column">
  logsql\_message\_column
</h2>

<ExperimentalBadge />

<SettingsInfoBlock type="String" default_value="_msg" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "_msg"},{"label": "新增设置，用于指定 'logsql' 方言中 `_msg` 字段所引用的列。"}]}]} />

指定 'logsql' 方言中 `_msg` 字段 (LogsQL 过滤器的默认字段) 所引用的列名。

<h2 id="logsql_table">
  logsql\_table
</h2>

<ExperimentalBadge />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": ""},{"label": "新增设置，用于指定 'logsql' 方言所使用的日志表。"}]}]} />

指定 'logsql' 方言所使用的日志表名称。

<h2 id="logsql_time_column">
  logsql\_time\_column
</h2>

<ExperimentalBadge />

<SettingsInfoBlock type="String" default_value="_time" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "_time"},{"label": "新增设置，用于指定 'logsql' 方言中 `_time` 字段所对应的列。"}]}]} />

指定 'logsql' 方言中 `_time` 字段所对应的列名。