Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 436 discussion

A. "without adding infrastructure" means scaling vertically and choosing larger instance. "MOST cost-effectively" reserved instances

without adding infrastructure means without adding more capacity per instance, multi-az adding read replicas solve the problem.

accommodate the larger workload without adding infrastructure. = Reserved DB instance

B - Multi-AZ is for HA, does not help 'accommodating the larger workload' C - Adding "another instance" will not help, we can't split the workload between two instances D - On-demand instance is a good choice for unknown workload, but here we know the workload, it's just higher than before

Cannot add more infrastructure - C is invalid Multi AZ DB instance is for high availability and failure mitigation, does not increase performance, higher workload support - B is invalid On demand instances are costlier than Reserved instances - D is invalid

Not A : "launched a new product", reserved instances are for known workloads, a new product doesn't have known workload. Not B : "accommodate the larger workload", while Multi-AZ can help with larger workloads, they are more for higher availability. Not C : "without adding infrastructure", adding a PostGresQL instance is new infrastructure.

B is the best approach in this scenario overall: Making the RDS PostgreSQL instance Multi-AZ adds a standby replica to handle larger workloads and provides high availability. Even though it adds infrastructure, the cost is less than doubling the infrastructure with a separate DB instance. It provides better performance, availability, and disaster recovery than a single larger instance.

Buy larger instance.

Keyword "Amazon RDS for PostgreSQL instance large" . See list of size of instance at https://aws.amazon.com/rds/instance-types/

A. Not C: without adding infrastructure

Answer - C Option B, making the Amazon RDS for PostgreSQL DB instance a Multi-AZ DB instance, would provide high availability and fault tolerance but may not directly address the need for increased capacity to handle the larger workload. Therefore, the recommended solution is Option C: Buy reserved DB instances for the workload and add another Amazon RDS for PostgreSQL DB instance to accommodate the increased workload in a cost-effective manner.

C Option C: buying reserved DB instances for the total workload and adding another Amazon RDS for PostgreSQL DB instance seems to be the most appropriate choice. It allows for workload distribution across multiple instances, providing scalability and potential performance improvements. Additionally, reserved instances can provide cost savings in the long term.

A for me, because without adding additional infrastructure

Should be C