A company runs a production PostgreSQL database on Amazon RDS. The database size is 2 TB and it runs 24/7. The company expects to use this database for the next 3 years. What is the MOST cost-effective purchasing option?

Answer options:

On-Demand Instances

Partial Upfront Reserved Instances

All Upfront Reserved Instances

Compute Savings Plans

How to approach this question

Look for '24/7 workload', '3 years', and 'MOST cost-effective'. All Upfront RIs provide the deepest discount.

Full Answer

C.All Upfront Reserved Instances✓ Correct

All Upfront Reserved Instances

For steady-state, predictable database workloads running 24/7 over a long period (1 or 3 years), Amazon RDS Reserved Instances provide significant discounts compared to On-Demand pricing. The 'All Upfront' payment option yields the highest discount.

Common mistakes

Selecting Compute Savings Plans, forgetting that they do not cover RDS instances.

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Practice the full AWS SAA-C03 Practice Exam 3

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