Request Syntax Request Parameters Response Syntax Response Elements Errors Examples See Also

StartMetadataModelAssessment

Queues an assessment of the selected source metadata models (database objects such as tables, views, and procedures) to evaluate conversion complexity to the target database format. If other requests created by Start* operations are already in the migration project's queue, the assessment begins after they complete.

The assessment request loads metadata models that are not yet in the metadata tree, but does not reload metadata models that are already present. If your source database has changed since the metadata was loaded, refresh the affected metadata models with StartMetadataModelImport before calling this operation.

To check the status of the assessment request, call DescribeMetadataModelAssessments using the returned RequestIdentifier as a filter.

To export the conversion assessment report after the request completes successfully, call ExportMetadataModelAssessment.

Required permissions: dms:StartMetadataModelAssessment. For more information, see Actions, resources, and condition keys for Amazon Database Migration Service.

Request Syntax


{
   "MigrationProjectIdentifier": "string",
   "SelectionRules": "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.

MigrationProjectIdentifier

The migration project name or Amazon Resource Name (ARN).

Type: String

Length Constraints: Maximum length of 255.

Required: Yes

SelectionRules

A JSON string that identifies the metadata models to assess. For the selection rule format and examples, see Selection rules in DMS Schema Conversion.

Usage:

Accepts only source selection rules, where server-name in the object locator matches the source data provider.
Supports explicit, include, and exclude rule actions.

Type: String

Required: Yes

Response Syntax


{
   "RequestIdentifier": "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.

RequestIdentifier

The identifier for the assessment request.

Type: String

Errors

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

AccessDeniedFault

Amazon DMS was denied access to the endpoint. Check that the role is correctly configured.

message

HTTP Status Code: 400

InvalidResourceStateFault

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

message

HTTP Status Code: 400

KMSKeyNotAccessibleFault

Amazon DMS cannot access the KMS key.

message

HTTP Status Code: 400

ResourceAlreadyExistsFault

The resource you are attempting to create already exists.

message
resourceArn

HTTP Status Code: 400

ResourceNotFoundFault

The resource could not be found.

message

HTTP Status Code: 400

ResourceQuotaExceededFault

The quota for this resource quota has been exceeded.

message

HTTP Status Code: 400

S3AccessDeniedFault

Insufficient privileges are preventing access to an Amazon S3 object.

HTTP Status Code: 400

S3ResourceNotFoundFault

A specified Amazon S3 bucket, bucket folder, or other object can't be found.

HTTP Status Code: 400

Examples

Assess all objects in a schema

The following example queues an assessment of the conversion complexity for all objects in the ExampleSchema schema.

Sample Request


POST / HTTP/1.1
Host: dms.<region>.<domain>
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=<SignedHeaders>, Signature=<Signature>
X-Amz-Date: <Date>
X-Amz-Target: AmazonDMSv20160101.StartMetadataModelAssessment
{
    "MigrationProjectIdentifier": "arn:aws:dms:us-east-1:111122223333:migration-project:EXAMPLEABCDEFGHIJKLMNOPQRS",
    "SelectionRules": "{\"rules\": [{\"rule-type\": \"selection\",\"rule-id\": \"1\",\"rule-name\": \"1\",\"object-locator\": {\"server-name\": \"example-source-server.us-east-1.rds.amazonaws.com\", \"schema-name\": \"ExampleSchema\"},\"rule-action\": \"explicit\"}]}"
}

Sample Response


HTTP/1.1 200 OK
x-amzn-RequestId: <RequestId>
Content-Type: application/x-amz-json-1.1
Content-Length: <PayloadSizeBytes>
Date: <Date>
{
    "RequestIdentifier": "a1b2c3d4-5678-90ab-cdef-EXAMPLE11111"
}