← SAA-C03·Amazon Web Services

Question 450 of 1,040

Design High-Performing Architectures →hardMultiple SelectObjective-mapped

Quick Answer

The correct answer is to use Application Auto Scaling scheduled actions to raise provisioned concurrency before 09:00 UTC and lower it afterward. Provisioned concurrency eliminates cold starts by keeping a specified number of Lambda execution environments initialized and ready to respond immediately, which directly stabilizes p95 latency during predictable traffic spikes. On the SAA-C03 exam, this scenario tests your understanding of Lambda scaling mechanisms versus generic auto scaling—a common trap is confusing provisioned concurrency with reserved concurrency, which only caps execution but does not pre-warm environments. Remember that provisioned concurrency must be attached to a published Lambda version or alias, not the $LATEST alias, to work with scheduled actions. Memory tip: think of provisioned concurrency as a “pre-heated engine” for forecastable surges, while reserved concurrency is just a “parking space limit.”

SAA-C03 Design High-Performing Architectures Practice Question

This SAA-C03 practice question tests your understanding of design high-performing architectures. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 serverless checkout API uses AWS Lambda behind API Gateway. Every weekday at 09:00 UTC, marketing triggers a predictable surge. The first few minutes after each surge show cold-start latency, but traffic volume is forecastable and the business wants stable p95 latency. Which two changes should the team implement? Select two.

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.

Question 1hardmulti select

Full question →

A
Publish a Lambda version and attach provisioned concurrency to an alias that points to that version.
Provisioned concurrency keeps execution environments initialized and ready to serve requests, which is the correct way to reduce cold starts. Using an alias tied to a published version is the standard deployment pattern for managing that setting safely. This directly improves p95 latency during predictable bursts.
B
Use Application Auto Scaling scheduled actions to raise provisioned concurrency before 09:00 UTC and lower it afterward.
Because the traffic spike is predictable, scheduled scaling lets the team pre-warm enough Lambda capacity before the busy period begins. Scaling down later avoids paying for unused concurrency for the entire day. This is both performant and cost-aware for a known recurring pattern.
C
Increase the Lambda timeout so the function has more time to initialize during the spike.
Why wrong: A longer timeout does not remove cold starts or pre-initialize execution environments. It only changes how long a function may run before timing out. The user-facing latency issue would remain, so this does not solve the core problem.
D
Double the memory size during the spike without changing the concurrency model.
Why wrong: More memory can improve CPU allocation and sometimes reduce execution duration, but it does not guarantee that the environment is already warm. Without provisioned concurrency, the first requests can still incur cold-start penalties. The scenario specifically calls for stable p95 latency.
E
Move the function into more Availability Zones so the platform can spread cold starts across regions.
Why wrong: Lambda already runs as a managed regional service and does not need the customer to place individual functions across AZs. Spreading across AZs does not eliminate cold starts. The issue is initialization time, not geographic distribution.

Full breakdown with real-world context →

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

✓

Publish a Lambda version and attach provisioned concurrency to an alias that points to that version.

Provisioned concurrency keeps a specified number of Lambda execution environments initialized and ready to respond immediately, eliminating cold starts for predictable traffic patterns. By publishing a Lambda version and attaching provisioned concurrency to an alias pointing to that version, the team ensures that the surge at 09:00 UTC is handled without cold-start latency, stabilizing p95 latency.

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.

✓
Publish a Lambda version and attach provisioned concurrency to an alias that points to that version.
Why this is correct
Provisioned concurrency keeps execution environments initialized and ready to serve requests, which is the correct way to reduce cold starts. Using an alias tied to a published version is the standard deployment pattern for managing that setting safely. This directly improves p95 latency during predictable bursts.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use Application Auto Scaling scheduled actions to raise provisioned concurrency before 09:00 UTC and lower it afterward.
Why this is correct
Because the traffic spike is predictable, scheduled scaling lets the team pre-warm enough Lambda capacity before the busy period begins. Scaling down later avoids paying for unused concurrency for the entire day. This is both performant and cost-aware for a known recurring pattern.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the Lambda timeout so the function has more time to initialize during the spike.
Why it's wrong here
A longer timeout does not remove cold starts or pre-initialize execution environments. It only changes how long a function may run before timing out. The user-facing latency issue would remain, so this does not solve the core problem.
✗
Double the memory size during the spike without changing the concurrency model.
Why it's wrong here
More memory can improve CPU allocation and sometimes reduce execution duration, but it does not guarantee that the environment is already warm. Without provisioned concurrency, the first requests can still incur cold-start penalties. The scenario specifically calls for stable p95 latency.
✗
Move the function into more Availability Zones so the platform can spread cold starts across regions.
Why it's wrong here
Lambda already runs as a managed regional service and does not need the customer to place individual functions across AZs. Spreading across AZs does not eliminate cold starts. The issue is initialization time, not geographic distribution.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse increasing Lambda timeout or memory with solving cold-start latency, but these settings do not pre-warm execution environments; only provisioned concurrency (and optionally scheduled scaling) directly eliminates cold starts for predictable surges.

Trap categories for this question

Scenario analysis trap
More memory can improve CPU allocation and sometimes reduce execution duration, but it does not guarantee that the environment is already warm. Without provisioned concurrency, the first requests can still incur cold-start penalties. The scenario specifically calls for stable p95 latency.

Detailed technical explanation

How to think about this question

Provisioned concurrency works by pre-initializing a specified number of execution environments, each with the function code and runtime loaded, so that when requests arrive, they are served instantly without the cold-start overhead. Under the hood, AWS Lambda uses a pool of warm containers; provisioned concurrency ensures that a minimum number of these containers are always warm, even during idle periods, and can be combined with Application Auto Scaling scheduled actions to automatically adjust the count before and after predictable traffic spikes, optimizing cost and performance.

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

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.

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.

Related SAA-C03 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Design Secure Architectures practice questions

Practise SAA-C03 questions linked to Design Secure Architectures.

Design Resilient Architectures practice questions

Practise SAA-C03 questions linked to Design Resilient Architectures.

Design High-Performing Architectures practice questions

Practise SAA-C03 questions linked to Design High-Performing Architectures.

Design Cost-Optimized Architectures practice questions

Practise SAA-C03 questions linked to Design Cost-Optimized Architectures.

SAA-C03 VPC practice questions

Practise SAA-C03 questions linked to SAA-C03 VPC.

SAA-C03 S3 lifecycle policy questions

Practise SAA-C03 questions linked to SAA-C03 S3 lifecycle policy questions.

SAA-C03 RDS Multi-AZ questions

Practise SAA-C03 questions linked to SAA-C03 RDS Multi-AZ questions.

SAA-C03 IAM policy practice questions

Practise SAA-C03 questions linked to SAA-C03 IAM policy.

SAA-C03 Route 53 failover questions

Practise SAA-C03 questions linked to SAA-C03 Route 53 failover questions.

SAA-C03 CloudFront practice questions

Practise SAA-C03 questions linked to SAA-C03 CloudFront.

SAA-C03 NAT gateway questions

Practise SAA-C03 questions linked to SAA-C03 NAT gateway questions.

SAA-C03 VPC endpoint questions

Practise SAA-C03 questions linked to SAA-C03 VPC endpoint questions.

Practice this exam

Start a free SAA-C03 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

SAA-C03 practice-test guide →Study guide →Browse all practice tests

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: Publish a Lambda version and attach provisioned concurrency to an alias that points to that version. — Provisioned concurrency keeps a specified number of Lambda execution environments initialized and ready to respond immediately, eliminating cold starts for predictable traffic patterns. By publishing a Lambda version and attaching provisioned concurrency to an alias pointing to that version, the team ensures that the surge at 09:00 UTC is handled without cold-start latency, stabilizing p95 latency.

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Same concept, more angles

1 more ways this is tested on SAA-C03

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A serverless checkout API runs on AWS Lambda behind API Gateway. Traffic spikes are predictable every weekday at 09:00 UTC, and p95 latency jumps for the first few minutes after each deployment because execution environments are cold. The team wants to reduce this startup impact without changing the API contract. Which changes should they make? Select three.

hard

✓ A.Configure provisioned concurrency on the production Lambda alias during the busy windows.
✓ B.Initialize SDK clients and other reusable objects outside the handler so they are created once per execution environment.
✓ C.Reduce the deployment package size and remove unnecessary layers to shorten function initialization.
D.Replace provisioned concurrency with reserved concurrency because reserved concurrency keeps instances warm.
E.Increase the function timeout so the first request has more time to warm up.

Why A: Provisioned concurrency initializes a specified number of execution environments in advance, so when traffic spikes at 09:00 UTC, the Lambda function is already warm and can serve requests without cold start latency. This directly addresses the p95 latency jump after deployment without altering the API contract.

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This SAA-C03 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 SAA-C03 exam.