AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A global retail company hosts its primary e-commerce platform in the us-east-1 Region. Product images and other static assets are stored in an Amazon S3 bucket. Transactional data is stored in an Amazon Aurora PostgreSQL-Compatible Edition cluster.
The company plans to add a disaster-recovery site in the us-west-2 Region and sets these objectives:
Transactional data must have a Recovery Point Objective (RPO) of less than 1 minute and a Recovery Time Objective (RTO) of less than 15 minutes.
Static assets must be replicated to us-west-2 under a predictable, SLA-backed window of 15 minutes or less.
Which combination of services and configurations most cost-effectively meets these requirements?
Create an Amazon Aurora Global Database with a secondary cluster in us-west-2. Enable Amazon S3 Cross-Region Replication with S3 Replication Time Control on the S3 bucket.
Configure an Amazon RDS for PostgreSQL cross-Region read replica in us-west-2. Enable standard Amazon S3 Cross-Region Replication (CRR).
Schedule hourly cross-Region snapshots of the Aurora cluster to us-west-2. Enable standard Amazon S3 Cross-Region Replication (CRR).
Use AWS Database Migration Service (AWS DMS) for continuous database replication to an Aurora cluster in us-west-2. Use an AWS Lambda function to copy new S3 objects to a bucket in us-west-2.
Use Amazon Aurora Global Database to protect transactional data and Amazon S3 Cross-Region Replication (CRR) with S3 Replication Time Control (RTC) to protect static assets.
Aurora Global Database replicates changes to a secondary Region with typical latency below 1 second and allows promotion of the secondary cluster to full read/write in under 1 minute. This satisfies the <1-minute RPO and <15-minute RTO for the database.
S3 CRR with RTC offers an SLA to replicate 99.9 % (99.99 % design goal) of objects within 15 minutes, with most objects replicating in seconds. This meets the predictable-replication requirement for static assets and supports the overall 15-minute RTO.
Incorrect options:
An RDS cross-Region read replica offers asynchronous replication and manual promotion that often takes several minutes or longer, so it may not meet the 15-minute RTO, and standard S3 CRR lacks an SLA.
Hourly cross-Region snapshots plus standard CRR is a backup-and-restore strategy, producing RPO and RTO that exceed the stated goals.
Continuous AWS DMS replication plus custom Lambda-based S3 replication adds operational overhead and still lacks the SLA and failover speed that Aurora Global Database and S3 RTC provide.
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What is the Amazon Aurora Global Database and why is it suited for disaster recovery?
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What is Amazon S3 Cross-Region Replication with S3 Replication Time Control (RTC)?
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Why are other options, like RDS read replicas or AWS DMS, not suitable for this scenario?
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AWS Certified Solutions Architect Professional SAP-C02
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