SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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.
Exhibit
Lambda logs:
REPORT RequestId: 9d6b... Duration: 184.27 ms Billed Duration: 185 ms Memory Size: 1024 MB Max Memory Used: 612 MB Init Duration: 812.43 ms
Traffic pattern:
- Low traffic outside weekdays 09:00-09:15 UTC
- Predictable spike every weekday
- Function language: Python 3.12
- No need to keep spare capacity all day
Based on the exhibit, a serverless checkout API is implemented in AWS Lambda and deployed in one Region. The function has a cold-start time of 700-900 ms on the first request after idle periods. Marketing launches a predictable traffic spike every weekday at 09:00 UTC, and the p95 latency target is under 150 ms during the first five minutes of the spike. What should the solutions architect do to meet the latency target while controlling cost?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Lambda logs:
REPORT RequestId: 9d6b... Duration: 184.27 ms Billed Duration: 185 ms Memory Size: 1024 MB Max Memory Used: 612 MB Init Duration: 812.43 ms
Traffic pattern:
- Low traffic outside weekdays 09:00-09:15 UTC
- Predictable spike every weekday
- Function language: Python 3.12
- No need to keep spare capacity all day
A
Increase the Lambda memory size and leave concurrency at the default value.
Why wrong: More memory can improve execution speed, but it does not eliminate cold starts when a function has been idle.
B
Configure provisioned concurrency and scale it up before the predictable spike begins.
Provisioned concurrency keeps pre-initialized environments ready, which removes most cold-start latency. Because the spike is predictable, you can scale concurrency before 09:00 UTC and reduce it afterward to control cost.
C
Put the Lambda function behind an Application Load Balancer so the load balancer absorbs the initialization delay.
Why wrong: An ALB does not remove Lambda initialization time; it only changes how requests are routed to the function.
D
Set reserved concurrency to the expected peak so Lambda will pre-create execution environments.
Why wrong: Reserved concurrency limits concurrent executions, but it does not pre-warm execution environments or eliminate cold starts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure provisioned concurrency and scale it up before the predictable spike begins.
Provisioned concurrency pre-warms a specified number of execution environments so that the Lambda function has zero cold-start latency when invoked. By scheduling the provisioned concurrency to scale up before the 09:00 UTC spike, the function can serve the first requests within the 150 ms p95 latency target, while the scheduled scaling down after the spike controls cost by releasing unused capacity.
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.
✗
Increase the Lambda memory size and leave concurrency at the default value.
Why it's wrong here
More memory can improve execution speed, but it does not eliminate cold starts when a function has been idle.
✓
Configure provisioned concurrency and scale it up before the predictable spike begins.
Why this is correct
Provisioned concurrency keeps pre-initialized environments ready, which removes most cold-start latency. Because the spike is predictable, you can scale concurrency before 09:00 UTC and reduce it afterward to control cost.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Put the Lambda function behind an Application Load Balancer so the load balancer absorbs the initialization delay.
Why it's wrong here
An ALB does not remove Lambda initialization time; it only changes how requests are routed to the function.
✗
Set reserved concurrency to the expected peak so Lambda will pre-create execution environments.
Why it's wrong here
Reserved concurrency limits concurrent executions, but it does not pre-warm execution environments or eliminate cold starts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between provisioned concurrency (which pre-warms environments to eliminate cold starts) and reserved concurrency (which only caps the maximum concurrent executions without affecting cold-start behavior).
Detailed technical explanation
How to think about this question
Provisioned concurrency works by keeping a specified number of execution environments initialized and ready to handle requests, effectively eliminating the cold-start latency for those environments. Under the hood, AWS Lambda pre-warms the runtime and initializes the function code, so the first invocation after idle periods experiences no delay. In real-world scenarios, this is critical for applications with predictable traffic spikes, such as e-commerce flash sales or daily batch processing, where even a 700 ms cold start would cause unacceptable latency.
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 High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure provisioned concurrency and scale it up before the predictable spike begins. — Provisioned concurrency pre-warms a specified number of execution environments so that the Lambda function has zero cold-start latency when invoked. By scheduling the provisioned concurrency to scale up before the 09:00 UTC spike, the function can serve the first requests within the 150 ms p95 latency target, while the scheduled scaling down after the spike controls cost by releasing unused capacity.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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