A company has a multi-tier application running in a single AWS Region. The database tier uses Amazon Aurora MySQL. The company wants to improve resilience by expanding to a second region. They require an RTO of less than 5 minutes and an RPO of less than 1 minute. The application tier is stateless and deployed via AWS CloudFormation. What is the MOST cost-effective architecture to meet these requirements?

Answer options:

Use Aurora Global Database. Deploy the application tier in the second region with Auto Scaling groups at full capacity. Use Route 53 latency routing.

Use Aurora Global Database. Deploy the application tier in the second region with Auto Scaling groups at 0 capacity. Use Route 53 failover routing.

Take hourly snapshots of the Aurora cluster and copy them to the second region. Deploy the application tier via CloudFormation during a disaster.

Use AWS Database Migration Service (DMS) to replicate data to an RDS MySQL instance in the second region. Keep application instances stopped.

How to approach this question

Balance the strict RPO/RTO with the 'most cost-effective' constraint (Pilot Light).

Full Answer

B.Use Aurora Global Database. Deploy the application tier in the second region with Auto Scaling groups at 0 capacity. Use Route 53 failover routing.✓ Correct

Aurora Global Database provides sub-second RPO and fast RTO. Keeping the Auto Scaling group at 0 capacity in the secondary region (Pilot Light) minimizes costs while allowing rapid scaling during a failover to meet the 5-minute RTO.

Common mistakes

Choosing Active-Active (full capacity), which ignores the cost-effective requirement.

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