- A
Increase the function timeout so throttling is less likely.
Why wrong: Timeout affects how long a request can run, not how many requests can run concurrently. Throttling is typically related to concurrency limits rather than time limits. Increasing timeout does not reserve capacity for another function.
- B
Set Reserved Concurrency for the important Lambda function.
Reserved concurrency allocates a guaranteed amount of concurrent execution capacity to a specific Lambda. This prevents other functions from consuming all concurrency and throttling the important one. If the reserved limit is reached, only that function is throttled, isolating impact.
- C
Enable Provisioned Concurrency for every Lambda in the account.
Why wrong: Provisioned Concurrency is useful for reducing cold starts, but it is not primarily a mechanism to guarantee capacity against account-wide spikes. Applying it to every function increases cost. Reserved concurrency is the direct control for prioritizing concurrency capacity.
- D
Reduce the number of IAM policies attached to the Lambda roles.
Why wrong: IAM policy count does not control Lambda concurrency throttling. Throttling behavior depends on concurrency limits, scaling, and provisioned settings. Reducing IAM complexity improves manageability, not runtime concurrency availability.
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.
A system uses multiple AWS Lambda functions behind different event sources. One Lambda occasionally spikes and causes other Lambdas to be throttled due to shared concurrency limits. Which setting best helps ensure the important Lambda keeps capacity during spikes?
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.
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
Set Reserved Concurrency for the important Lambda function.
Reserved Concurrency guarantees a set number of concurrent executions for a specific Lambda function, isolating it from the account-level concurrency pool. This ensures that the important function always has capacity available, even when other functions spike and consume the shared pool. Without this setting, all functions compete for the same 1,000 concurrent executions (default regional limit), and a spike in one can throttle others.
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 function timeout so throttling is less likely.
Why it's wrong here
Timeout affects how long a request can run, not how many requests can run concurrently. Throttling is typically related to concurrency limits rather than time limits. Increasing timeout does not reserve capacity for another function.
- ✓
Set Reserved Concurrency for the important Lambda function.
Why this is correct
Reserved concurrency allocates a guaranteed amount of concurrent execution capacity to a specific Lambda. This prevents other functions from consuming all concurrency and throttling the important one. If the reserved limit is reached, only that function is throttled, isolating impact.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable Provisioned Concurrency for every Lambda in the account.
Why it's wrong here
Provisioned Concurrency is useful for reducing cold starts, but it is not primarily a mechanism to guarantee capacity against account-wide spikes. Applying it to every function increases cost. Reserved concurrency is the direct control for prioritizing concurrency capacity.
- ✗
Reduce the number of IAM policies attached to the Lambda roles.
Why it's wrong here
IAM policy count does not control Lambda concurrency throttling. Throttling behavior depends on concurrency limits, scaling, and provisioned settings. Reducing IAM complexity improves manageability, not runtime concurrency availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Provisioned Concurrency (which reduces cold starts) with Reserved Concurrency (which guarantees capacity), leading them to choose Option C, even though Provisioned Concurrency does not protect against throttling from other functions.
Detailed technical explanation
How to think about this question
Lambda's concurrency model operates at the account and Region level, with a default burst concurrency of 500-3000 depending on the Region, and a steady-state limit of 1,000 concurrent executions. Reserved Concurrency deducts from this pool and creates a hard cap for the function, meaning if the reserved concurrency is set to 100, the function can never use more than 100 concurrent executions, but it also guarantees that those 100 are always available to it. This is critical for mission-critical functions like payment processing or order validation, where throttling could cause data loss or customer-facing errors.
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.
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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: Set Reserved Concurrency for the important Lambda function. — Reserved Concurrency guarantees a set number of concurrent executions for a specific Lambda function, isolating it from the account-level concurrency pool. This ensures that the important function always has capacity available, even when other functions spike and consume the shared pool. Without this setting, all functions compete for the same 1,000 concurrent executions (default regional limit), and a spike in one can throttle others.
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". 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
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.
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