PAS-C01 Technology Practice Question
A company is migrating a legacy monolithic application to a microservices architecture on AWS. The application currently uses an Oracle database with complex stored procedures. The company wants to minimize changes to the application code during migration. Which database migration strategy should the company use?
⚠ Common exam trap
Watch out — candidates often assume any AWS-managed database service (like Aurora or DynamoDB) is automatically better, overlooking the critical requirement to minimize code changes by keeping the same database engine.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Replatform the application by migrating the Oracle database to Amazon RDS for Oracle
The company wants to minimize changes to the application code during migration. By replatforming the Oracle database to Amazon RDS for Oracle, the application can continue to use the same Oracle database engine, stored procedures, and SQL dialect with minimal or no code changes. This approach avoids the need to rewrite complex stored procedures or adapt to a different database engine, which would be required with other migration strategies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Migrate the database to Amazon Aurora with PostgreSQL compatibility using the AWS Database Migration Service (DMS)
Why it's wrong here
Aurora PostgreSQL is a different database engine; stored procedures may need to be rewritten, increasing code changes.
- ✗
Store the data in Amazon S3 and use Athena for querying
Why it's wrong here
S3 and Athena are suitable for analytics, not for transactional OLTP workloads with stored procedures.
- ✗
Refactor the application to use Amazon DynamoDB as the database
Why it's wrong here
DynamoDB is NoSQL and requires significant application changes, which contradicts the requirement to minimize code changes.
- ✓
Replatform the application by migrating the Oracle database to Amazon RDS for Oracle
Why this is correct
Migrating to RDS for Oracle preserves the existing SQL dialect and stored procedures, minimizing code changes while leveraging managed database services.
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