- A
Use S3 Object Lambda to process the object as it is being retrieved.
Why wrong: Wrong. S3 Object Lambda processes objects on GET requests (retrieval), not upon upload. For post-upload processing, you need a trigger like S3 event notifications.
- B
Use an S3 event notification to invoke a Lambda function that copies the object to an EC2 instance for processing.
Why wrong: Wrong. Copying objects to an EC2 instance adds management overhead and cost, and EC2 instances run continuously even when idle, increasing expenses.
- C
Use AWS Fargate to run a container that polls S3 for new objects and processes them.
Why wrong: Wrong. AWS Fargate is more complex and costly for this simple processing task compared to Lambda. It requires container management and runs continuously even when there are no files to process.
- D
Use an S3 event notification to invoke a Lambda function that downloads the file, processes it, and uploads results.
Correct. S3 event notifications invoke a Lambda function directly when a new object is created. This allows processing the file in a serverless manner, minimizing cost and complexity. The Lambda function can efficiently handle the file by streaming and processing within its limits.
How to Use S3 Object Lambda for Large File Processing
This DVA-C02 practice question tests your understanding of development with aws services. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. A key principle to apply: s3 Event Notification. 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 designing a serverless application that processes large files uploaded to Amazon S3. Each file can be up to 5 GB. The processing involves extracting metadata and generating thumbnails. The developer wants to minimize processing time and cost. Which approach should the developer take?
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
Use an S3 event notification to invoke a Lambda function that downloads the file, processes it, and uploads results.
Option D is correct because S3 event notifications can trigger a Lambda function immediately after an object is uploaded. The Lambda function can download the file from S3, extract metadata and generate thumbnails, then store the results. This approach is serverless and cost-effective, as you pay only for compute time. While Lambda has execution time and memory limits, processing a 5 GB file for metadata and thumbnails can be optimized to fit within these limits, making it the most appropriate choice among the options.
Key principle: S3 Event Notification
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use S3 Object Lambda to process the object as it is being retrieved.
Why it's wrong here
Wrong. S3 Object Lambda processes objects on GET requests (retrieval), not upon upload. For post-upload processing, you need a trigger like S3 event notifications.
- ✗
Use an S3 event notification to invoke a Lambda function that copies the object to an EC2 instance for processing.
Why it's wrong here
Wrong. Copying objects to an EC2 instance adds management overhead and cost, and EC2 instances run continuously even when idle, increasing expenses.
- ✗
Use AWS Fargate to run a container that polls S3 for new objects and processes them.
Why it's wrong here
Wrong. AWS Fargate is more complex and costly for this simple processing task compared to Lambda. It requires container management and runs continuously even when there are no files to process.
- ✓
Use an S3 event notification to invoke a Lambda function that downloads the file, processes it, and uploads results.
Why this is correct
Correct. S3 event notifications invoke a Lambda function directly when a new object is created. This allows processing the file in a serverless manner, minimizing cost and complexity. The Lambda function can efficiently handle the file by streaming and processing within its limits.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
S3 Event Notification
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often choose S3 Object Lambda for any processing, but it only acts on data retrieval. For upload-triggered processing, S3 event notification with Lambda is the standard serverless pattern.
Detailed technical explanation
How to think about this question
S3 Object Lambda works by intercepting GET requests and invoking a Lambda function that can transform the data on the fly using a streaming response. The function receives the original object from S3 via a pre-signed URL and can return modified data without storing it, which is ideal for metadata extraction and thumbnail generation because you can process chunks as they stream. Under the hood, S3 Object Lambda uses the `WriteGetObjectResponse` API to send transformed data back to the requester, enabling real-time processing without intermediate storage.
KKey Concepts to Remember
- S3 Event Notification
- AWS Lambda
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
S3 Event Notification
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
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review s3 Event Notification, then practise related DVA-C02 questions on the same topic to reinforce the concept.
- →
Development with AWS Services — study guide chapter
Learn the concepts, then practise the questions
- →
Development with AWS Services practice questions
Targeted practice on this topic area only
- →
All DVA-C02 questions
1,616 questions across all exam domains
- →
AWS Certified Developer Associate DVA-C02 study guide
Full concept coverage aligned to exam objectives
- →
DVA-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related DVA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Development with AWS Services practice questions
Practise DVA-C02 questions linked to Development with AWS Services.
Security practice questions
Practise DVA-C02 questions linked to Security.
Deployment practice questions
Practise DVA-C02 questions linked to Deployment.
Troubleshooting and Optimization practice questions
Practise DVA-C02 questions linked to Troubleshooting and Optimization.
DVA-C02 fundamentals practice questions
Practise DVA-C02 questions linked to DVA-C02 fundamentals.
DVA-C02 scenario practice questions
Practise DVA-C02 questions linked to DVA-C02 scenario.
DVA-C02 troubleshooting practice questions
Practise DVA-C02 questions linked to DVA-C02 troubleshooting.
Practice this exam
Start a free DVA-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — S3 Event Notification.
What is the correct answer to this question?
The correct answer is: Use an S3 event notification to invoke a Lambda function that downloads the file, processes it, and uploads results. — Option D is correct because S3 event notifications can trigger a Lambda function immediately after an object is uploaded. The Lambda function can download the file from S3, extract metadata and generate thumbnails, then store the results. This approach is serverless and cost-effective, as you pay only for compute time. While Lambda has execution time and memory limits, processing a 5 GB file for metadata and thumbnails can be optimized to fit within these limits, making it the most appropriate choice among the options.
What should I do if I get this DVA-C02 question wrong?
Review s3 Event Notification, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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?
S3 Event Notification
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 →
Keep practising
More DVA-C02 practice questions
- A developer is troubleshooting an AWS Lambda function that is triggered by an S3 event. The function occasionally fails…
- A developer needs to call AWS APIs from application code running on EC2. Which credential source should the AWS SDK use…
- A developer needs to allow an IAM user in a different AWS account to assume a role in the developer's account. The role…
- A developer needs to grant an IAM role in Account B read-only access to objects in an S3 bucket in Account A. The bucket…
- An API Gateway HTTP API should allow access only to users authenticated by an external OIDC provider. Which authorizer t…
- A developer needs to allow an EC2 instance to read from a DynamoDB table. Which is the best practice to grant permission…
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.
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.
Sign in to join the discussion.