SAP-C02 Q606 · DR

Question

A company is replicating an application in a secondary Region. The application uses DynamoDB and RDS for MySQL. The secondary Region must function independently during a disaster. What should the architect do?

Accepted Answer

**Answer A: DynamoDB global tables + RDS read replica** satisfies every requirement:

1. **Cross-Region replication for DynamoDB**: Global tables automatically replicate data across multiple AWS Regions. Each Region's replica is a fully functional read/write table, so during a disaster the secondary Region can operate independently with full read/write capability — no promotion step needed for DynamoDB.

2. **Cross-Region replication for RDS MySQL**: A cross-Region read replica asynchronously replicates data from the primary Region. During a disaster, the read replica can be **promoted to a standalone primary instance**, giving the secondary Region full read/write capability. This is the standard AWS-recommended DR pattern for RDS.

3. **Independent operation during disaster**: Both global

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