- A
Processing records from a DynamoDB Stream in real time
DynamoDB Streams can trigger Lambda for real-time processing.
- B
Running a scheduled task every hour to clean up old database records
CloudWatch Events can trigger Lambda on a schedule.
- C
Serving as a web server for a static website
Why wrong: Lambda is event-driven; static websites are better on S3 or CloudFront.
- D
Hosting a long-running web application with WebSockets
Why wrong: Lambda has a 15-minute timeout and is not ideal for long-running connections.
- E
Processing objects uploaded to an S3 bucket
S3 can trigger Lambda on object creation.
Question 589 of 1,616
AWS Lambda Valid Use Cases
This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which THREE of the following are valid use cases for AWS Lambda? (Choose three.)
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
✓
Processing records from a DynamoDB Stream in real time
Option A is correct because AWS Lambda can be configured as an event source mapping for DynamoDB Streams, enabling real-time processing of record changes. When items in a DynamoDB table are created, updated, or deleted, the stream captures the change and Lambda is invoked synchronously with a batch of records, allowing immediate reaction to data modifications.
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.
- ✓
Processing records from a DynamoDB Stream in real time
Why this is correct
DynamoDB Streams can trigger Lambda for real-time processing.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Running a scheduled task every hour to clean up old database records
Why this is correct
CloudWatch Events can trigger Lambda on a schedule.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Serving as a web server for a static website
Why it's wrong here
Lambda is event-driven; static websites are better on S3 or CloudFront.
- ✗
Hosting a long-running web application with WebSockets
Why it's wrong here
Lambda has a 15-minute timeout and is not ideal for long-running connections.
- ✓
Processing objects uploaded to an S3 bucket
Why this is correct
S3 can trigger Lambda on object creation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Lambda's ability to handle HTTP requests via API Gateway with the idea that Lambda itself can serve as a web server, ignoring its stateless nature and execution timeout constraints.
Detailed technical explanation
How to think about this question
Lambda integrates with DynamoDB Streams via event source mappings that poll the stream and invoke the function synchronously with a batch size (default 100) and a maximum batching window (up to 300 seconds). The function receives a list of records containing the new and old images of the item, enabling patterns like real-time aggregation, cross-region replication, or triggering downstream workflows. A real-world scenario is building a leaderboard that updates instantly when a game score changes in DynamoDB.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Processing records from a DynamoDB Stream in real time — Option A is correct because AWS Lambda can be configured as an event source mapping for DynamoDB Streams, enabling real-time processing of record changes. When items in a DynamoDB table are created, updated, or deleted, the stream captures the change and Lambda is invoked synchronously with a batch of records, allowing immediate reaction to data modifications.
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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