AWS Certified Database – Specialty — Question 174

A company wants to migrate its existing on-premises Oracle database to Amazon Aurora PostgreSQL. The migration must be completed with minimal downtime using AWS DMS. A Database Specialist must validate that the data was migrated accurately from the source to the target before the cutover. The migration must have minimal impact on the performance of the source database.
Which approach will MOST effectively meet these requirements?

Answer options

• A. Use the AWS Schema Conversion Tool (AWS SCT) to convert source Oracle database schemas to the target Aurora DB cluster. Verify the datatype of the columns.
• B. Use the table metrics of the AWS DMS task created for migrating the data to verify the statistics for the tables being migrated and to verify that the data definition language (DDL) statements are completed.
• C. Enable the AWS Schema Conversion Tool (AWS SCT) premigration validation and review the premigration checklist to make sure there are no issues with the conversion.
• D. Enable AWS DMS data validation on the task so the AWS DMS task compares the source and target records, and reports any mismatches.

Correct answer: D

Explanation

The correct answer is D because enabling AWS DMS data validation allows for real-time comparison of records between the source and target databases, ensuring that any discrepancies are identified before cutover. Options A and C focus on schema conversion and validation checks but do not address data accuracy after migration. Option B checks statistics but does not provide a direct comparison of the actual data transferred.