- A
Enable Lambda provisioned concurrency on a published function alias and set the minimum provisioned instances to the baseline expected during spikes.
Provisioned concurrency pre-initializes Lambda execution environments for a specific alias, reducing cold start latency.
- B
Increase the function memory size to the maximum and rely on the larger memory to eliminate cold starts.
Why wrong: More memory can improve runtime performance, but it does not guarantee removal of cold starts.
- C
Configure an ALB with target group health checks to keep Lambda warm by sending periodic requests.
Why wrong: Periodic warm-up calls are not a reliable or scalable mechanism compared to provisioned concurrency for consistent latency.
- D
Turn on AWS CloudTrail data events to monitor cold start frequency and tune the runtime accordingly.
Why wrong: Monitoring does not prevent cold starts; it only provides visibility so it cannot meet the latency requirement by itself.
Quick Answer
The answer is to enable Lambda provisioned concurrency on a published function alias and set the minimum provisioned instances to the baseline expected during spikes. This configuration pre-warms a fixed number of execution environments, so when traffic surges from near zero, those requests are handled instantly without the 800 ms cold start penalty. On the SAA-C03 exam, this scenario tests your understanding of how provisioned concurrency decouples initialization latency from invocation, especially for API-driven serverless architectures with unpredictable traffic. A common trap is confusing provisioned concurrency with reserved concurrency—reserved concurrency only caps capacity, it does not keep instances warm. Remember the mnemonic: “Provisioned = Pre-warmed, Reserved = Restricted.” By setting the minimum to the spike baseline, you ensure consistent low latency without over-provisioning during idle periods.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Lambda function behind an API needs consistent low latency. Traffic normally drops to near zero, then spikes several times per hour. During spikes, the p95 latency often spikes above 800 ms due to cold starts. The team wants to keep using Lambda (no containers) but minimize cold start impact during predictable spikes. What is the best AWS configuration to meet this goal?
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.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Enable Lambda provisioned concurrency on a published function alias and set the minimum provisioned instances to the baseline expected during spikes.
Provisioned concurrency initializes a specified number of execution environments in advance, keeping them warm and ready to handle requests instantly. By setting the minimum provisioned instances to the baseline expected during spikes, the function avoids cold starts for those requests, ensuring p95 latency stays low even when traffic surges from near zero.
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.
- ✓
Enable Lambda provisioned concurrency on a published function alias and set the minimum provisioned instances to the baseline expected during spikes.
Why this is correct
Provisioned concurrency pre-initializes Lambda execution environments for a specific alias, reducing cold start latency.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the function memory size to the maximum and rely on the larger memory to eliminate cold starts.
Why it's wrong here
More memory can improve runtime performance, but it does not guarantee removal of cold starts.
- ✗
Configure an ALB with target group health checks to keep Lambda warm by sending periodic requests.
Why it's wrong here
Periodic warm-up calls are not a reliable or scalable mechanism compared to provisioned concurrency for consistent latency.
- ✗
Turn on AWS CloudTrail data events to monitor cold start frequency and tune the runtime accordingly.
Why it's wrong here
Monitoring does not prevent cold starts; it only provides visibility so it cannot meet the latency requirement by itself.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse provisioned concurrency with reserved concurrency, or assume that increasing memory or using health checks can eliminate cold starts, when only provisioned concurrency guarantees pre-warmed environments for predictable spikes.
Detailed technical explanation
How to think about this question
Provisioned concurrency works by pre-initializing a pool of execution environments that are kept idle but ready; when a request arrives, it is routed to an already-warm environment, bypassing the cold start overhead. The minimum provisioned instances act as a floor, ensuring that even when traffic drops to zero, the specified number of environments remain warm, so spikes are absorbed without delay. This is distinct from reserved concurrency, which only caps the maximum number of concurrent executions without pre-warming.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
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: Enable Lambda provisioned concurrency on a published function alias and set the minimum provisioned instances to the baseline expected during spikes. — Provisioned concurrency initializes a specified number of execution environments in advance, keeping them warm and ready to handle requests instantly. By setting the minimum provisioned instances to the baseline expected during spikes, the function avoids cold starts for those requests, ensuring p95 latency stays low even when traffic surges from near zero.
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: "best", "minimum / minimize". 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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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