[ aws . rds ]



Downloads all or a portion of the specified log file, up to 1 MB in size.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

download-db-log-file-portion is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: LogFileData


--db-instance-identifier <value>
--log-file-name <value>
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]


--db-instance-identifier (string)

The customer-assigned name of the DB instance that contains the log files you want to list.


  • Must match the identifier of an existing DBInstance.

--log-file-name (string)

The name of the log file to be downloaded.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.


To download a DB log file

The following download-db-log-file-portion example downloads only the latest part of your log file, saving it to a local file named tail.txt.

aws rds download-db-log-file-portion \
    --db-instance-identifier test-instance \
    --log-file-name log.txt \
    --output text > tail.txt

To download the entire file, you need to include the --starting-token 0 parameter. The following example saves the output to a local file named full.txt.

aws rds download-db-log-file-portion \
    --db-instance-identifier test-instance \
    --log-file-name log.txt \
    --starting-token 0 \
    --output text > full.txt

The saved file might contain blank lines. They appear at the end of each part of the log file while being downloaded. This generally doesn’t cause any trouble in your log file analysis.


LogFileData -> (string)

Entries from the specified log file.

Marker -> (string)

A pagination token that can be used in a later DownloadDBLogFilePortion request.

AdditionalDataPending -> (boolean)

Boolean value that if true, indicates there is more data to be downloaded.