The answer is to use target tracking scaling with a schedule to increase minimum capacity during business hours. This hybrid strategy is correct because target tracking scaling dynamically adjusts the number of ECS Fargate tasks based on a specified metric, such as CPU or memory utilization, while a scheduled action overrides the minimum capacity during predictable high-traffic windows, ensuring a baseline of resources is always available. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of combining reactive and predictive scaling to handle variable traffic patterns without cold starts or over-provisioning. A common trap is choosing only target tracking scaling, which can lag during sudden spikes, or only scheduled scaling, which wastes resources if traffic is lower than expected. The key insight is that ECS Fargate autoscaling with target tracking and scheduled scaling together optimizes cost by scaling down at night and maintains performance during business hours. Memory tip: think "schedule the floor, track the ceiling"—scheduled actions set the minimum floor, while target tracking handles the dynamic ceiling.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 is migrating a monolithic application to microservices on Amazon ECS with Fargate. The application has variable traffic patterns, with high traffic during business hours and low traffic at night. They want to optimize costs while maintaining performance. Which scaling strategy should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use target tracking scaling with a schedule to increase minimum capacity during business hours.
Option A is correct because combining target tracking scaling with a scheduled action allows the application to dynamically adjust capacity based on actual demand while ensuring a higher baseline during peak business hours. This hybrid approach optimizes costs by scaling down at night and maintains performance by preventing cold starts or lag during traffic spikes, which is ideal for variable patterns on ECS Fargate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 target tracking scaling with a schedule to increase minimum capacity during business hours.
Why this is correct
This combination handles both patterns.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use step scaling policies based on memory utilization.
Why it's wrong here
Step scaling is more complex, not necessary here.
✗
Use scheduled scaling to increase capacity during business hours.
Use simple scaling policies based on CPU utilization.
Why it's wrong here
Simple scaling is less responsive.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose scheduled scaling alone (Option C) thinking it directly handles variable traffic, but they miss that it cannot react to unexpected spikes or lulls within the scheduled window, whereas target tracking with a schedule provides both proactive and reactive scaling.
Detailed technical explanation
How to think about this question
Target tracking scaling in ECS uses a predefined metric (e.g., CPU or memory) and a target value, automatically adjusting the desired count to maintain that target, similar to a thermostat. The scheduled action modifies the minimum capacity, which is a separate parameter from the scaling policy, ensuring a baseline is set before dynamic adjustments occur. In real-world scenarios, this prevents the 'scale-up lag' when traffic surges at 9 AM, as the minimum capacity already accommodates the expected load.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use target tracking scaling with a schedule to increase minimum capacity during business hours. — Option A is correct because combining target tracking scaling with a scheduled action allows the application to dynamically adjust capacity based on actual demand while ensuring a higher baseline during peak business hours. This hybrid approach optimizes costs by scaling down at night and maintains performance by preventing cold starts or lag during traffic spikes, which is ideal for variable patterns on ECS Fargate.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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