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Navigating AWS Pricing: A Focus on Savings Plans
Learn how to tackle a tricky AWS Certified Solutions Architect - Associate exam question on compute usage discounts.
Understanding AWS pricing can be challenging. Candidates often trip over questions about discounts for compute usage. This post will clarify a specific question from the SAA-C03 exam regarding the best purchasing option for compute services.
The question
Which purchasing option provides a discount for a consistent amount of compute usage (measured in dollars per hour) with the most flexibility across EC2, Fargate, and Lambda?
- A) Standard Reserved Instances
- B) Compute Savings Plans
- C) Convertible Reserved Instances
- D) Spot Instances
Think before you scroll
Before selecting an answer, consider how each option applies to different services. The question asks for flexibility across multiple compute services, which is crucial for making the right choice.
The answer
The correct option is B) Compute Savings Plans. These plans offer a discount for a consistent dollar amount of compute usage across EC2, Fargate, and Lambda. They provide the most flexibility, allowing you to adjust your usage without being tied to specific instance types or regions.
Why the other options lose
- A) Standard Reserved Instances: This option requires a commitment to specific instance types and regions. Such constraints limit flexibility, making it unsuitable for a question focused on broad applicability.
- C) Convertible Reserved Instances: While these allow changes to instance types, they still tie you to a specific instance and region. This is not as flexible as Compute Savings Plans, which cover multiple services.
- D) Spot Instances: Spot Instances provide cost savings by allowing you to bid on unused capacity, but they do not guarantee availability and can be interrupted. This option does not offer a consistent discount based on committed usage, making it irrelevant for this question.
The concept behind it
The principle at play is understanding the differences between pricing models in AWS. Compute Savings Plans are designed for users needing flexibility across compute services, unlike Reserved Instances that bind you to specific resources. Knowing the trade-offs of each model will help you navigate similar questions.
Exam trap to remember
Remember: Compute Savings Plans offer flexibility across multiple services, while Reserved Instances tie you to specific configurations. Keep this in mind when evaluating discount options on the exam.