> ## 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.

# s3_max_* 会话设置

> ClickHouse 在 s3_max_* 自动生成分组中的会话设置。

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，并根据 [源代码](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp) 自动生成。

<div id="s3_max_connections">
  ## s3\_max\_connections
</div>

<SettingsInfoBlock type="UInt64" default_value="1024" />

每台服务器的最大连接数。

<div id="s3_max_get_burst">
  ## s3\_max\_get\_burst
</div>

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

在触发每秒请求数限制之前，可同时发起的最大请求数。默认值 (0) 等于 `s3_max_get_rps`

<div id="s3_max_get_rps">
  ## s3\_max\_get\_rps
</div>

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

在触发限流前，S3 GET 请求的每秒速率上限。0 表示不受限制。

<div id="s3_max_inflight_parts_for_one_file">
  ## s3\_max\_inflight\_parts\_for\_one\_file
</div>

<SettingsInfoBlock type="UInt64" default_value="20" />

分段上传请求中可同时上传的分片最大数量。0 表示不受限制。

<div id="s3_max_part_number">
  ## s3\_max\_part\_number
</div>

<SettingsInfoBlock type="UInt64" default_value="10000" />

S3 上传分片的最大分片编号。

<div id="s3_max_put_burst">
  ## s3\_max\_put\_burst
</div>

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

在达到每秒请求数限制前，可同时发出的最大请求数。默认值 (0) 等于 `s3_max_put_rps`

<div id="s3_max_put_rps">
  ## s3\_max\_put\_rps
</div>

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

S3 PUT 请求在触发限流前的每秒速率上限。0 表示不限制。

<div id="s3_max_single_operation_copy_size">
  ## s3\_max\_single\_operation\_copy\_size
</div>

<SettingsInfoBlock type="UInt64" default_value="33554432" />

S3 中单次复制操作的最大大小。仅当 s3\_allow\_multipart\_copy 为 true 时，此设置才生效。

<div id="s3_max_single_part_upload_size">
  ## s3\_max\_single\_part\_upload\_size
</div>

<SettingsInfoBlock type="UInt64" default_value="33554432" />

使用单分片方式上传到 S3 时，对象的最大大小。

<div id="s3_max_single_read_retries">
  ## s3\_max\_single\_read\_retries
</div>

<SettingsInfoBlock type="UInt64" default_value="4" />

单次 S3 读取的最大重试次数。

<div id="s3_max_unexpected_write_error_retries">
  ## s3\_max\_unexpected\_write\_error\_retries
</div>

<SettingsInfoBlock type="UInt64" default_value="4" />

S3 写入期间发生异常错误时的最大重试次数。

<div id="s3_max_upload_part_size">
  ## s3\_max\_upload\_part\_size
</div>

<SettingsInfoBlock type="UInt64" default_value="5368709120" />

向 S3 执行分段上传时，单个分片的最大大小。