- A
Use an AWS Lambda function to poll the SQS queue and invoke a new task for each message.
Why wrong: Lambda has a 15-minute timeout and is not designed for long-running CPU-bound processing.
- B
Configure ECS Service Auto Scaling with a target tracking scaling policy based on the SQS queue's ApproximateNumberOfMessagesVisible metric.
This directly scales tasks based on queue depth, providing proactive scaling.
- C
Increase the CPU allocation for the task definition to process messages faster.
Why wrong: This is vertical scaling and may not be sufficient; also, it does not add more tasks.
- D
Use a CloudWatch alarm based on CPU utilization to trigger an Auto Scaling action.
Why wrong: CPU utilization is a lagging indicator and may not react quickly enough to queue depth changes.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs a containerized microservices application on Amazon ECS using Fargate. The application includes a service that processes messages from an Amazon SQS queue. The service is CPU-bound and takes longer to process messages as the queue depth increases. The team wants to automatically scale the number of tasks based on the queue depth. Which solution is MOST effective?
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
Configure ECS Service Auto Scaling with a target tracking scaling policy based on the SQS queue's ApproximateNumberOfMessagesVisible metric.
Option B is correct because ECS Service Auto Scaling can use a target tracking scaling policy with the SQS ApproximateNumberOfMessagesVisible metric to scale the number of tasks based on queue depth. Option A is wrong because using a Lambda function to poll the SQS queue and invoke a new ECS task for each message is inefficient; Lambda is not designed for long-running CPU-bound tasks, and invoking tasks per message adds overhead and complexity. Option C is wrong because increasing CPU allocation is a vertical scaling approach that does not automatically adjust based on queue depth; it may not address scaling needs and can lead to overprovisioning. Option D is wrong because a CloudWatch alarm based on CPU utilization may react slowly to changes in queue depth, as CPU utilization may not immediately reflect the processing backlog.
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 an AWS Lambda function to poll the SQS queue and invoke a new task for each message.
Why it's wrong here
Lambda has a 15-minute timeout and is not designed for long-running CPU-bound processing.
- ✓
Configure ECS Service Auto Scaling with a target tracking scaling policy based on the SQS queue's ApproximateNumberOfMessagesVisible metric.
Why this is correct
This directly scales tasks based on queue depth, providing proactive scaling.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the CPU allocation for the task definition to process messages faster.
Why it's wrong here
This is vertical scaling and may not be sufficient; also, it does not add more tasks.
- ✗
Use a CloudWatch alarm based on CPU utilization to trigger an Auto Scaling action.
Why it's wrong here
CPU utilization is a lagging indicator and may not react quickly enough to queue depth changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Continuous Improvement for Existing Solutions — study guide chapter
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Continuous Improvement for Existing Solutions practice questions
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure ECS Service Auto Scaling with a target tracking scaling policy based on the SQS queue's ApproximateNumberOfMessagesVisible metric. — Option B is correct because ECS Service Auto Scaling can use a target tracking scaling policy with the SQS ApproximateNumberOfMessagesVisible metric to scale the number of tasks based on queue depth. Option A is wrong because using a Lambda function to poll the SQS queue and invoke a new ECS task for each message is inefficient; Lambda is not designed for long-running CPU-bound tasks, and invoking tasks per message adds overhead and complexity. Option C is wrong because increasing CPU allocation is a vertical scaling approach that does not automatically adjust based on queue depth; it may not address scaling needs and can lead to overprovisioning. Option D is wrong because a CloudWatch alarm based on CPU utilization may react slowly to changes in queue depth, as CPU utilization may not immediately reflect the processing backlog.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAP-C02 exam.
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