> ## 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.

# insert_quorum_* 会话设置

> ClickHouse 中 insert_quorum_* 自动生成分组下的会话设置。

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="insert_quorum">
  ## insert\_quorum
</div>

<SettingsInfoBlock type="UInt64Auto" default_value="0" />

<Note>
  此设置不适用于 SharedMergeTree，更多信息请参见 [SharedMergeTree 一致性](/zh/products/cloud/features/infrastructure/shared-merge-tree#consistency)。
</Note>

启用仲裁写入。

* 如果 `insert_quorum < 2`，则仲裁写入被禁用。
* 如果 `insert_quorum >= 2`，则启用仲裁写入。
* 如果 `insert_quorum = 'auto'`，则使用多数值 (`number_of_replicas / 2 + 1`) 作为仲裁数量。

仲裁写入

仅当 ClickHouse 在 `insert_quorum_timeout` 期间成功将数据写入 `insert_quorum` 个副本时，`INSERT` 才会成功。如果由于任何原因，成功写入的副本数未达到 `insert_quorum`，则此次写入会被视为失败，ClickHouse 会从所有已写入数据的副本中删除该插入块。

当 `insert_quorum_parallel` 被禁用时，仲裁中的所有副本都保持一致，也就是说，它们包含此前所有 `INSERT` 查询的数据 (`INSERT` 序列是线性化的) 。读取通过 `insert_quorum` 写入的数据时，如果 `insert_quorum_parallel` 被禁用，可以通过 [select\_sequential\_consistency](/zh/reference/settings/session-settings/other#select_sequential_consistency) 为 `SELECT` 查询启用顺序一致性。

ClickHouse 会生成异常：

* 如果查询时可用副本的数量少于 `insert_quorum`。
* 当 `insert_quorum_parallel` 被禁用，并且在前一个块尚未写入 `insert_quorum` 个副本之前又尝试写入数据时。这种情况可能发生在前一个带有 `insert_quorum` 的 `INSERT` 尚未完成时，用户又尝试对同一个表执行另一条 `INSERT` 查询。

另请参见：

* [insert\_quorum\_timeout](/zh/reference/settings/session-settings/insert-quorum#insert_quorum_timeout)
* [insert\_quorum\_parallel](/zh/reference/settings/session-settings/insert-quorum#insert_quorum_parallel)
* [select\_sequential\_consistency](/zh/reference/settings/session-settings/other#select_sequential_consistency)

<div id="insert_quorum_parallel">
  ## insert\_quorum\_parallel
</div>

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

<Note>
  此设置不适用于 SharedMergeTree，更多信息请参见 [SharedMergeTree 一致性](/zh/products/cloud/features/infrastructure/shared-merge-tree#consistency)。
</Note>

启用或禁用仲裁 `INSERT` 查询的并行执行。如果启用，则在之前的查询尚未完成时，仍可发送额外的 `INSERT` 查询。如果禁用，则会拒绝对同一表的额外写入。

可能的值：

* 0 — 禁用。
* 1 — 启用。

另请参见：

* [insert\_quorum](/zh/reference/settings/session-settings/insert-quorum#insert_quorum)
* [insert\_quorum\_timeout](/zh/reference/settings/session-settings/insert-quorum#insert_quorum_timeout)
* [select\_sequential\_consistency](/zh/reference/settings/session-settings/other#select_sequential_consistency)

<div id="insert_quorum_timeout">
  ## insert\_quorum\_timeout
</div>

<SettingsInfoBlock type="Milliseconds" default_value="600000" />

以毫秒为单位的仲裁写入超时时间。如果超时时间已到且仍未完成写入，ClickHouse 将抛出异常，客户端必须重试该查询，将同一个块写入同一副本或其他任意副本。

另请参见：

* [insert\_quorum](/zh/reference/settings/session-settings/insert-quorum#insert_quorum)
* [insert\_quorum\_parallel](/zh/reference/settings/session-settings/insert-quorum#insert_quorum_parallel)
* [select\_sequential\_consistency](/zh/reference/settings/session-settings/other#select_sequential_consistency)