- A
Configure the S3 bucket to send events to an SQS queue, and poll the queue from CodePipeline.
Why wrong: CodePipeline cannot poll SQS queues directly.
- B
Create an Amazon CloudWatch Events rule that triggers on S3 object creation events and targets the pipeline.
CloudWatch Events (EventBridge) can capture S3 events and start the pipeline automatically.
- C
Set up a periodic Lambda function that checks the S3 bucket for new files and starts the pipeline.
Why wrong: This is inefficient and not a best practice; EventBridge provides event-driven triggering.
- D
Configure the S3 bucket to send events to an SNS topic, and subscribe CodePipeline to the topic.
Why wrong: SNS is not a supported trigger for CodePipeline; EventBridge is the correct integration.
Question 1,057 of 1,616
Automatically Trigger CodePipeline from S3
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is building a CI/CD pipeline using AWS CodePipeline. The source stage is an Amazon S3 bucket. The developer wants to automatically start the pipeline when a new file is uploaded to the S3 bucket. What should the developer do?
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
✓
Create an Amazon CloudWatch Events rule that triggers on S3 object creation events and targets the pipeline.
Option B is correct because Amazon CloudWatch Events (now Amazon EventBridge) can directly target an AWS CodePipeline pipeline as a rule target. By creating a rule that matches S3 object creation events (e.g., `s3:ObjectCreated:*`), the pipeline is automatically triggered without any intermediate polling, custom code, or additional services. This is the native, serverless integration recommended by AWS.
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.
- ✗
Configure the S3 bucket to send events to an SQS queue, and poll the queue from CodePipeline.
Why it's wrong here
CodePipeline cannot poll SQS queues directly.
- ✓
Create an Amazon CloudWatch Events rule that triggers on S3 object creation events and targets the pipeline.
Why this is correct
CloudWatch Events (EventBridge) can capture S3 events and start the pipeline automatically.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up a periodic Lambda function that checks the S3 bucket for new files and starts the pipeline.
Why it's wrong here
This is inefficient and not a best practice; EventBridge provides event-driven triggering.
- ✗
Configure the S3 bucket to send events to an SNS topic, and subscribe CodePipeline to the topic.
Why it's wrong here
SNS is not a supported trigger for CodePipeline; EventBridge is the correct integration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SNS or SQS as valid CodePipeline triggers, but AWS CodePipeline only supports CloudWatch Events/EventBridge, webhooks (for GitHub), and manual or scheduled triggers—not direct SNS subscriptions or SQS polling.
Detailed technical explanation
How to think about this question
Under the hood, CloudWatch Events uses event patterns to match S3 event notifications (which are published to the default event bus). When a match occurs, the rule invokes the CodePipeline `StartPipelineExecution` API call. This integration is synchronous and near real-time, with typical latency under one second. A subtle behavior: the S3 bucket must have versioning enabled for CodePipeline to track source revisions correctly; otherwise, overwrites may cause unexpected behavior.
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
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.
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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: Create an Amazon CloudWatch Events rule that triggers on S3 object creation events and targets the pipeline. — Option B is correct because Amazon CloudWatch Events (now Amazon EventBridge) can directly target an AWS CodePipeline pipeline as a rule target. By creating a rule that matches S3 object creation events (e.g., `s3:ObjectCreated:*`), the pipeline is automatically triggered without any intermediate polling, custom code, or additional services. This is the native, serverless integration recommended by AWS.
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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