- A
Use Spot Instances for the ETL workload, and configure the job to checkpoint frequently and restart on interruption.
Spot can significantly reduce costs, and checkpointing plus retries mitigate interruption risk.
- B
Use Reserved Instances with a 1-year term to lower costs, since reservations provide discounts for any usage.
Why wrong: Reserved Instances discount On-Demand-like capacity but do not exploit the largest discount available for interruptible work.
- C
Switch to On-Demand but enable Auto Scaling so the job finishes faster during peak hours.
Why wrong: Auto Scaling can improve speed, but it does not address the primary cost driver of always-on On-Demand usage.
- D
Use Spot Instances but disable checkpointing to simplify the application.
Why wrong: Without checkpointing, interruptions can cause substantial recomputation and may miss the 7:00 AM deadline.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: spot Instances offer up to 90% savings compared to On-Demand prices.. 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 data engineering team runs a nightly ETL job on EC2. The job can be checkpointed every 5 minutes and can be retried from the last checkpoint if the instance terminates. The job runtime varies from 2 to 4 hours, and the team has no need for a specific instance type, as long as it completes before 7:00 AM local time. They currently run the job on On-Demand EC2, leading to high monthly compute cost.
Which change best reduces cost while maintaining the business deadline?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use Spot Instances for the ETL workload, and configure the job to checkpoint frequently and restart on interruption.
Option A is correct because Spot Instances offer significant cost savings (up to 90% compared to On-Demand) and are ideal for fault-tolerant, checkpointable workloads. The job's ability to checkpoint every 5 minutes and retry from the last checkpoint means it can gracefully handle Spot Instance interruptions, ensuring it still completes before the 7:00 AM deadline without incurring the high cost of On-Demand instances.
Key principle: Spot Instances offer up to 90% savings compared to On-Demand prices.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use Spot Instances for the ETL workload, and configure the job to checkpoint frequently and restart on interruption.
Why this is correct
Spot can significantly reduce costs, and checkpointing plus retries mitigate interruption risk.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Spot Instances offer up to 90% savings compared to On-Demand prices.
- ✗
Use Reserved Instances with a 1-year term to lower costs, since reservations provide discounts for any usage.
Why it's wrong here
Reserved Instances discount On-Demand-like capacity but do not exploit the largest discount available for interruptible work.
- ✗
Switch to On-Demand but enable Auto Scaling so the job finishes faster during peak hours.
Why it's wrong here
Auto Scaling can improve speed, but it does not address the primary cost driver of always-on On-Demand usage.
- ✗
Use Spot Instances but disable checkpointing to simplify the application.
Why it's wrong here
Without checkpointing, interruptions can cause substantial recomputation and may miss the 7:00 AM deadline.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think Reserved Instances are always cheaper, but they fail to consider the low utilization of a nightly job, making Spot Instances with checkpointing the true cost-optimized solution for fault-tolerant workloads.
Detailed technical explanation
How to think about this question
Spot Instances leverage AWS's spare EC2 capacity and can be reclaimed with a 2-minute interruption notice (via the EC2 Instance Rebalance Recommendation or the Amazon EventBridge interruption notice). Checkpointing every 5 minutes ensures that even if an instance is interrupted, the job loses at most 5 minutes of work, and the retry logic can resume from the last saved state. In practice, using Spot Instance diversification across multiple instance types and Availability Zones further increases resilience and cost savings.
KKey Concepts to Remember
- Spot Instances offer up to 90% savings compared to On-Demand prices.
- Spot Instances can be interrupted by AWS with a two-minute warning.
- Checkpointing and restart logic mitigate the risk of Spot Instance interruptions.
- Spot Instances are ideal for fault-tolerant, flexible, and stateless workloads.
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
Spot Instances offer up to 90% savings compared to On-Demand prices.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review spot Instances offer up to 90% savings compared to On-Demand prices., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Spot Instances offer up to 90% savings compared to On-Demand prices..
What is the correct answer to this question?
The correct answer is: Use Spot Instances for the ETL workload, and configure the job to checkpoint frequently and restart on interruption. — Option A is correct because Spot Instances offer significant cost savings (up to 90% compared to On-Demand) and are ideal for fault-tolerant, checkpointable workloads. The job's ability to checkpoint every 5 minutes and retry from the last checkpoint means it can gracefully handle Spot Instance interruptions, ensuring it still completes before the 7:00 AM deadline without incurring the high cost of On-Demand instances.
What should I do if I get this SAA-C03 question wrong?
Review spot Instances offer up to 90% savings compared to On-Demand prices., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Spot Instances offer up to 90% savings compared to On-Demand prices.
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Last reviewed: Jun 11, 2026
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