- A
Increase the Lambda function timeout to 30 minutes.
Why wrong: Lambda timeout can be up to 15 minutes, but API Gateway still times out at 29 seconds.
- B
Use an SQS queue to decouple the request and have the client poll for results.
This pattern allows the API to return immediately and the client to poll for the result asynchronously.
- C
Use Lambda function URL directly and bypass API Gateway.
Why wrong: Lambda function URLs have a maximum execution time of 15 minutes and a 30-second idle timeout, but the client would need to wait.
- D
Change the API Gateway integration to HTTP_PROXY type.
Why wrong: HTTP_PROXY also has a 29-second timeout and does not solve the long-running issue.
Question 429 of 1,616
API Gateway Long-Running Operations
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 building a REST API using API Gateway and AWS Lambda. The API must support long-running operations that can take up to 30 minutes. The current implementation uses synchronous Lambda invocation, causing API Gateway to timeout after 29 seconds. What solution should the developer implement?
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
✓
Use an SQS queue to decouple the request and have the client poll for results.
Option B is correct because API Gateway has a hard 29-second timeout for synchronous integrations, which cannot be extended. By using an SQS queue to decouple the request, the Lambda function can process the long-running operation asynchronously, and the client can poll an SQS queue or a separate status endpoint for the result, bypassing the API Gateway timeout limitation.
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 function timeout to 30 minutes.
Why it's wrong here
Lambda timeout can be up to 15 minutes, but API Gateway still times out at 29 seconds.
- ✓
Use an SQS queue to decouple the request and have the client poll for results.
Why this is correct
This pattern allows the API to return immediately and the client to poll for the result asynchronously.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Lambda function URL directly and bypass API Gateway.
Why it's wrong here
Lambda function URLs have a maximum execution time of 15 minutes and a 30-second idle timeout, but the client would need to wait.
- ✗
Change the API Gateway integration to HTTP_PROXY type.
Why it's wrong here
HTTP_PROXY also has a 29-second timeout and does not solve the long-running issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume increasing the Lambda timeout or changing the integration type will extend the API Gateway timeout, but the 29-second limit is immutable and applies to all synchronous integrations.
Detailed technical explanation
How to think about this question
API Gateway's 29-second timeout is a hard limit for all synchronous integration types (Lambda, HTTP, HTTP_PROXY, etc.). To handle operations exceeding this, you must implement an asynchronous pattern: the client submits a request, receives a task ID, and then polls a separate endpoint (e.g., an SQS queue or a DynamoDB-backed status table) for the result. This pattern is commonly used for video processing, report generation, or data export jobs that run for minutes.
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.
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.
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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: Use an SQS queue to decouple the request and have the client poll for results. — Option B is correct because API Gateway has a hard 29-second timeout for synchronous integrations, which cannot be extended. By using an SQS queue to decouple the request, the Lambda function can process the long-running operation asynchronously, and the client can poll an SQS queue or a separate status endpoint for the result, bypassing the API Gateway timeout limitation.
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.
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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