AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A financial-services company runs a critical trading application on an Amazon RDS for PostgreSQL Multi-AZ DB instance in the us-east-1 Region. The company must create a disaster-recovery site in eu-west-1 that meets the following requirements:
Recovery Point Objective (RPO): < 10 seconds
Recovery Time Objective (RTO): < 10 minutes
High reliability with minimal ongoing operational overhead for the database team
Which data-replication strategy should a solutions architect recommend to meet these requirements?
Schedule automated cross-Region snapshots of the RDS instance and restore the latest snapshot in a disaster scenario.
Use AWS Database Migration Service (DMS) with Change Data Capture (CDC) to keep a live copy of the database in eu-west-1.
Migrate the database to Amazon Aurora PostgreSQL-Compatible Edition and create an Aurora Global Database with a secondary cluster in eu-west-1.
Configure an Amazon RDS for PostgreSQL cross-Region read replica and promote it during a disaster event.
Migrating the workload to Amazon Aurora PostgreSQL-Compatible Edition and configuring an Aurora Global Database best meets the stated objectives. Aurora Global Database uses physical, storage-based replication that achieves typical cross-Region latency of sub-second, delivering an effective RPO of about 1 second. In the event of a Regional outage, a secondary Region can be promoted to read/write status in less than 1 minute, satisfying the 10-minute RTO. The feature is fully managed, so ongoing maintenance overhead is low.
RDS cross-Region read replica: replication is WAL-based over the network and AWS notes that lag can reach several minutes, so the RPO can exceed 10 seconds under normal load.
AWS DMS with CDC: introduces additional components to operate and typically shows higher replication latency than Aurora's storage-level replication, risking the RPO and increasing operational overhead.
Cross-Region automated or manual snapshots: snapshot frequency defines the RPO (usually hours) and a restore operation is required, making the RTO far longer than 10 minutes.
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