A critical financial application runs on Amazon EC2 instances behind an ALB. The database is Amazon Aurora PostgreSQL. The business requires an RPO of 1 second and an RTO of 1 minute in the event of a complete AWS Region failure. Which disaster recovery strategy meets these requirements?

Q: What mistakes do candidates make on this AWS SAP-C02 question?

Choosing cross-region read replicas, which rely on binlog replication and can have higher lag.

Answer options:

Use Aurora cross-region read replicas. Take manual snapshots and copy them to the secondary region.

Use AWS Backup to copy EC2 and Aurora backups to the secondary region daily.

Use Aurora Global Database. Deploy EC2 instances in an Auto Scaling group in the secondary region. Use Route 53 with latency-based routing and health checks.

Use DynamoDB Global Tables instead of Aurora. Deploy Lambda functions in the secondary region.

How to approach this question

Match the sub-second RPO requirement to Aurora Global Database.

Full Answer

C.Use Aurora Global Database. Deploy EC2 instances in an Auto Scaling group in the secondary region. Use Route 53 with latency-based routing and health checks.✓ Correct

Aurora Global Database uses dedicated infrastructure for fast cross-region replication (RPO < 1s). Having compute ready in the secondary region meets the fast RTO.

Common mistakes

Choosing cross-region read replicas, which rely on binlog replication and can have higher lag.

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