SAP-C02 Question #655: Real Exam Question with Answer & Explanation

Question

A company is currently in the design phase of an application that will need an RPO of less than 5 minutes and an RTO of less than 10 minutes. The solutions architecture team is forecasting that the database will store approximately 10 TB of data. As part of the design, they are looking for a database solution that will provide the company with the ability to fail over to a secondary Region. Which solution will meet these business requirements at the LOWEST cost?

Options

• ADeploy an Amazon Aurora DB cluster and take snapshots of the cluster every 5 minutes. Once a
• BDeploy an Amazon RDS instance with a cross-Region read replica in a secondary Region. In the
• CDeploy an Amazon Aurora DB cluster in the primary Region and another in a secondary Region.
• DDeploy an Amazon RDS instance with a read replica in the same Region. In the event of a failure,

Explanation

The company requires a multi-Region database solution for 10TB of data with an RPO of less than 5 minutes and an RTO of less than 10 minutes, at the lowest possible cost.

Common mistakes.

• A. Taking snapshots every 5 minutes and restoring them would likely exceed the 10-minute RTO for a 10 TB database and does not provide continuous replication for a low RPO.
• C. Deploying two separate Aurora clusters or an Aurora Global Database would meet RPO/RTO but would be significantly more expensive than an RDS cross-Region read replica, failing the lowest cost requirement.
• D. Deploying a read replica in the same Region does not provide disaster recovery to a secondary Region, failing to meet the multi-Region DR requirement.

Concept tested. Cross-Region RDS Read Replicas for DR

Reference. https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.Replication.html#Overview.Replication.CrossRegion

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