> ## 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.

# s3_max_* session settings

> ClickHouse session settings in the s3_max_* generated group.

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
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are available in [system.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="s3_max_connections">
  s3\_max\_connections
</h2>

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

The maximum number of connections per server.

<h2 id="s3_max_get_burst">
  s3\_max\_get\_burst
</h2>

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

Max number of requests that can be issued simultaneously before hitting request per second limit. By default (0) equals to `s3_max_get_rps`

<h2 id="s3_max_get_rps">
  s3\_max\_get\_rps
</h2>

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

Limit on S3 GET request per second rate before throttling. Zero means unlimited.

<h2 id="s3_max_inflight_parts_for_one_file">
  s3\_max\_inflight\_parts\_for\_one\_file
</h2>

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

The maximum number of a concurrent loaded parts in multipart upload request. 0 means unlimited.

<h2 id="s3_max_part_number">
  s3\_max\_part\_number
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.6"},{"label": "10000"},{"label": "Maximum part number number for s3 upload part"}]}]} />

Maximum part number number for s3 upload part.

<h2 id="s3_max_put_burst">
  s3\_max\_put\_burst
</h2>

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

Max number of requests that can be issued simultaneously before hitting request per second limit. By default (0) equals to `s3_max_put_rps`

<h2 id="s3_max_put_rps">
  s3\_max\_put\_rps
</h2>

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

Limit on S3 PUT request per second rate before throttling. Zero means unlimited.

<h2 id="s3_max_single_operation_copy_size">
  s3\_max\_single\_operation\_copy\_size
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.6"},{"label": "33554432"},{"label": "Maximum size for a single copy operation in s3"}]}]} />

Maximum size for single-operation copy in s3. This setting is used only if s3\_allow\_multipart\_copy is true.

<h2 id="s3_max_single_part_upload_size">
  s3\_max\_single\_part\_upload\_size
</h2>

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

The maximum size of object to upload using singlepart upload to S3.

<h2 id="s3_max_single_read_retries">
  s3\_max\_single\_read\_retries
</h2>

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

The maximum number of retries during single S3 read.

<h2 id="s3_max_unexpected_write_error_retries">
  s3\_max\_unexpected\_write\_error\_retries
</h2>

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

The maximum number of retries in case of unexpected errors during S3 write.

<h2 id="s3_max_upload_part_size">
  s3\_max\_upload\_part\_size
</h2>

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

The maximum size of part to upload during multipart upload to S3.