- A
Set the Lambda function timeout to less than the SQS visibility timeout.
This ensures messages are processed before becoming visible again, reducing duplicate invocations.
- B
Increase the SQS visibility timeout to 5 minutes and set Lambda timeout to 5 minutes.
Why wrong: Lambda timeout should be less than visibility timeout to allow for retries.
- C
Configure the Lambda function to process messages asynchronously.
Why wrong: SQS is already asynchronous; this doesn't address the visibility timeout issue.
- D
Set the Lambda reserved concurrency to 1 to limit concurrent executions.
Why wrong: This would cause throttling and delays, not optimize cost/performance.
Question 204 of 1,616
Setting Lambda Timeout Shorter than SQS Visibility Timeout for Optimal Processing
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer is deploying a Lambda function that processes messages from an SQS queue. The queue has a batch size of 10. To optimize cost and performance, the developer wants to minimize the number of Lambda invocations while ensuring that all messages are processed within the SQS visibility timeout. Which configuration should the developer use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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
✓
Set the Lambda function timeout to less than the SQS visibility timeout.
Option A is correct because setting the Lambda function timeout to less than the SQS visibility timeout ensures that the function either succeeds or fails before the visibility timeout expires. If the function fails, the message is not deleted from the queue and becomes visible again after the original visibility timeout, allowing for reprocessing. This minimizes unnecessary Lambda invocations by avoiding extra retries from SQS redrive policies while still guaranteeing that all messages are processed within the visibility window.
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.
- ✓
Set the Lambda function timeout to less than the SQS visibility timeout.
Why this is correct
This ensures messages are processed before becoming visible again, reducing duplicate invocations.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the SQS visibility timeout to 5 minutes and set Lambda timeout to 5 minutes.
Why it's wrong here
Lambda timeout should be less than visibility timeout to allow for retries.
- ✗
Configure the Lambda function to process messages asynchronously.
Why it's wrong here
SQS is already asynchronous; this doesn't address the visibility timeout issue.
- ✗
Set the Lambda reserved concurrency to 1 to limit concurrent executions.
Why it's wrong here
This would cause throttling and delays, not optimize cost/performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Lambda timeout with SQS visibility timeout, thinking they should be equal or that increasing both is safe, but the key is to keep Lambda timeout shorter to allow timely retries and avoid message duplication.
Detailed technical explanation
How to think about this question
Under the hood, SQS event source mapping uses a long-polling mechanism to retrieve messages in batches (up to 10) and invokes Lambda synchronously. The Lambda function must complete processing within the visibility timeout; if it doesn't, SQS makes the message visible again, leading to duplicate processing. Setting the function timeout lower than the visibility timeout ensures that any failure triggers a retry before the visibility timeout expires, optimizing the retry logic and reducing wasted invocations.
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.
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Development with AWS Services — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the Lambda function timeout to less than the SQS visibility timeout. — Option A is correct because setting the Lambda function timeout to less than the SQS visibility timeout ensures that the function either succeeds or fails before the visibility timeout expires. If the function fails, the message is not deleted from the queue and becomes visible again after the original visibility timeout, allowing for reprocessing. This minimizes unnecessary Lambda invocations by avoiding extra retries from SQS redrive policies while still guaranteeing that all messages are processed within the visibility window.
What should I do if I get this DVA-C02 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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DVA-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 DVA-C02 exam.
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