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SAA-C03 Practice Question: A company runs a SaaS application with highly…
This SAA-C03 practice question tests your understanding of a company runs a saas application with highly…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: aurora Serverless v2 scales from 0.5 ACUs to 128 ACUs in sub-second increments. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a SaaS application with highly unpredictable database load — it may receive zero queries for hours, then spike to thousands of queries per second briefly. The company wants to minimize database costs while handling all load levels without manual scaling. Which solution is MOST cost-effective?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Amazon Aurora Serverless v2 — scales automatically from minimum capacity during idle to maximum during spikes
Aurora Serverless v2 scales in sub-second increments based on actual load. You pay only for ACUs consumed — idle periods cost near-minimum. No manual scaling required.
B
Distractor review
Amazon Aurora Provisioned with Auto Scaling to add and remove read replicas
Aurora Auto Scaling adds/removes read replicas but cannot scale the primary writer. The provisioned primary incurs full instance cost during idle periods regardless of load.
C
Distractor review
Amazon RDS MySQL with scheduled stop/start to save costs during predictable off-hours
RDS stop/start halts the database — no queries can be served while stopped. SaaS applications with unpredictable access patterns require continuous availability.
D
Distractor review
Amazon DynamoDB with on-demand capacity mode — scales to any traffic level with no minimum cost
DynamoDB on-demand is excellent for NoSQL workloads but migrating a relational database to DynamoDB requires major application refactoring not implied by the question. Aurora Serverless v2 provides equivalent cost benefits without architectural changes.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Aurora Serverless v1 and v2 are different products. v1 supports true pause-to-zero but has a cold-start delay (~25 seconds) and fewer supported features. v2 scales much faster (sub-second), supports more Aurora features including Global Database and Multi-AZ, and scales to 0.5 ACU minimum. For modern architectures, Aurora Serverless v2 is the correct recommendation.
Technical deep dive
How to think about this question
Aurora Serverless v2 pricing: - ACU-hours at ~$0.12/ACU-hour (region dependent) - Minimum: 0.5 ACU when idle (not free, but very low cost) - Scales in 0.5 ACU increments up to 128 ACUs Comparison for 1 month with frequent idle periods: - Serverless v2 at 0.5 ACU base: ~$0.12 x 0.5 x 720h = $43/month base + spikes - Provisioned db.t4g.micro: ~$0.016/hour x 720 = $11.5/month (but cannot scale for spikes) - Provisioned db.r6g.large (handles spikes): ~$0.29/hour x 720 = $209/month always-on Serverless v2 wins when: significant idle time + variable/unpredictable spikes + no manual scaling desired.
KKey Concepts to Remember
- Aurora Serverless v2 scales from 0.5 ACUs to 128 ACUs in sub-second increments
- You pay only for ACUs consumed — idle periods cost near-minimum (0.5 ACU)
- Aurora Provisioned instances incur full cost regardless of actual load
- Aurora Auto Scaling adds/removes read replicas but cannot scale the primary writer
- Aurora Serverless v2 supports Multi-AZ, Global Database, and RDS Proxy
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Aurora Serverless v2 scales from 0.5 ACUs to 128 ACUs in sub-second increments
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Aurora Serverless v2 scales from 0.5 ACUs to 128 ACUs in sub-second increments
What is the correct answer to this question?
The correct answer is: Amazon Aurora Serverless v2 — scales automatically from minimum capacity during idle to maximum during spikes — Amazon Aurora Serverless v2 automatically scales database capacity based on actual load. It scales from a minimum of 0.5 ACUs during quiet periods to up to 128 ACUs during spikes within seconds. You pay only for the ACUs consumed — idle periods cost near-minimum. Aurora Provisioned requires pre-provisioning capacity for peak load, incurring full instance costs regardless of actual utilization. Even with Auto Scaling, the primary instance has a minimum provisioned capacity that runs at full cost during idle periods.
What should I do if I get this SAA-C03 question wrong?
Review aurora Serverless v2 scales from 0.5 ACUs to 128 ACUs in sub-second increments, then practise related SAA-C03 questions on the same topic to reinforce the concept.
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