AWS Database Migration Service
API Reference (API Version 2016-01-01)


Modifies the specified replication task.

You can't modify the task endpoints. The task must be stopped before you can modify it.

For more information about AWS DMS tasks, see the AWS DMS user guide at Working with Migration Tasks

Request Syntax

{ "CdcStartPosition": "string", "CdcStartTime": number, "CdcStopPosition": "string", "MigrationType": "string", "ReplicationTaskArn": "string", "ReplicationTaskIdentifier": "string", "ReplicationTaskSettings": "string", "TableMappings": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


Indicates when you want a change data capture (CDC) operation to start. Use either CdcStartPosition or CdcStartTime to specify when you want a CDC operation to start. Specifying both values results in an error.

The value can be in date, checkpoint, or LSN/SCN format.

Date Example: --cdc-start-position “2018-03-08T12:12:12”

Checkpoint Example: --cdc-start-position "checkpoint:V1#27#mysql-bin-changelog.157832:1975:-1:2002:677883278264080:mysql-bin-changelog.157832:1876#0#0#*#0#93"

LSN Example: --cdc-start-position “mysql-bin-changelog.000024:373”

Type: String

Required: No


Indicates the start time for a change data capture (CDC) operation. Use either CdcStartTime or CdcStartPosition to specify when you want a CDC operation to start. Specifying both values results in an error.

Type: Timestamp

Required: No


Indicates when you want a change data capture (CDC) operation to stop. The value can be either server time or commit time.

Server time example: --cdc-stop-position “server_time:3018-02-09T12:12:12”

Commit time example: --cdc-stop-position “commit_time: 3018-02-09T12:12:12 “

Type: String

Required: No


The migration type.

Valid values: full-load | cdc | full-load-and-cdc

Type: String

Valid Values: full-load | cdc | full-load-and-cdc

Required: No


The Amazon Resource Name (ARN) of the replication task.

Type: String

Required: Yes


The replication task identifier.


  • Must contain from 1 to 255 alphanumeric characters or hyphens.

  • First character must be a letter.

  • Cannot end with a hyphen or contain two consecutive hyphens.

Type: String

Required: No


JSON file that contains settings for the task, such as target metadata settings.

Type: String

Required: No


When using the AWS CLI or boto3, provide the path of the JSON file that contains the table mappings. Precede the path with "file://". When working with the DMS API, provide the JSON as the parameter value.

For example, --table-mappings file://mappingfile.json

Type: String

Required: No

Response Syntax

{ "ReplicationTask": { "CdcStartPosition": "string", "CdcStopPosition": "string", "LastFailureMessage": "string", "MigrationType": "string", "RecoveryCheckpoint": "string", "ReplicationInstanceArn": "string", "ReplicationTaskArn": "string", "ReplicationTaskCreationDate": number, "ReplicationTaskIdentifier": "string", "ReplicationTaskSettings": "string", "ReplicationTaskStartDate": number, "ReplicationTaskStats": { "ElapsedTimeMillis": number, "FullLoadProgressPercent": number, "TablesErrored": number, "TablesLoaded": number, "TablesLoading": number, "TablesQueued": number }, "SourceEndpointArn": "string", "Status": "string", "StopReason": "string", "TableMappings": "string", "TargetEndpointArn": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The replication task that was modified.

Type: ReplicationTask object


For information about the errors that are common to all actions, see Common Errors.


The resource is in a state that prevents it from being used for database migration.

HTTP Status Code: 400


AWS DMS cannot access the KMS key.

HTTP Status Code: 400


The resource you are attempting to create already exists.

HTTP Status Code: 400


The resource could not be found.

HTTP Status Code: 400


Sample Request

Sample Response

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: