- A
Use s3:ObjectCreated:*
Correct. s3:ObjectCreated:* captures all creation events, allowing the developer to filter updates in the processing function. While it does not exclusively trigger on new objects, it is the most comprehensive event type and is the intended answer given the limitations of S3 event notifications.
- B
Use s3:ObjectCreated:Post
Why wrong: Incorrect. s3:ObjectCreated:Post only triggers on POST uploads (usually browser-based). It still triggers on overwrites and is not the best choice for general new object detection.
- C
Use s3:ObjectCreated:Put
Why wrong: Incorrect. s3:ObjectCreated:Put triggers on any PUT operation, including overwrites of existing objects. Therefore, it does not satisfy the requirement to trigger only when new objects are created.
- D
Use s3:ObjectCreated:Copy
Why wrong: Incorrect. s3:ObjectCreated:Copy triggers on copy operations, which may create new objects but not the primary upload mechanism for new images.
S3 Event Notification Types
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. A key principle to apply: s3 Event Notifications. 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 serverless application that processes images uploaded to an S3 bucket. The processing includes generating thumbnails and storing metadata in DynamoDB. The developer wants to ensure that the processing function is triggered only when new objects are created, not when existing objects are updated. Which S3 event notification configuration should be used?
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 s3:ObjectCreated:*
Option A is correct because s3:ObjectCreated:* captures all object creation events, including PUT, POST, COPY, and CompleteMultipartUpload completions. While no S3 event type strictly distinguishes between new object creation and overwrite, using the wildcard ensures all creation events are captured, and additional logic (e.g., checking if the object previously existed) can be implemented in the processing function to filter out updates. In contrast, option C (s3:ObjectCreated:Put) also triggers on PUT operations that overwrite existing objects, so it does not satisfy the requirement to trigger only on new objects.
Key principle: S3 Event Notifications
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:ObjectCreated:*
Why this is correct
Correct. s3:ObjectCreated:* captures all creation events, allowing the developer to filter updates in the processing function. While it does not exclusively trigger on new objects, it is the most comprehensive event type and is the intended answer given the limitations of S3 event notifications.
Related concept
S3 Event Notifications
- ✗
Use s3:ObjectCreated:Post
Why it's wrong here
Incorrect. s3:ObjectCreated:Post only triggers on POST uploads (usually browser-based). It still triggers on overwrites and is not the best choice for general new object detection.
- ✗
Use s3:ObjectCreated:Put
Why it's wrong here
Incorrect. s3:ObjectCreated:Put triggers on any PUT operation, including overwrites of existing objects. Therefore, it does not satisfy the requirement to trigger only when new objects are created.
- ✗
Use s3:ObjectCreated:Copy
Why it's wrong here
Incorrect. s3:ObjectCreated:Copy triggers on copy operations, which may create new objects but not the primary upload mechanism for new images.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates think s3:ObjectCreated:Put is the right choice because it's the most common upload method, but it triggers on any PUT, including overwrites. The exam may test the understanding that S3 event notifications do not inherently differentiate between new objects and updates; all object creation events fire on both new and overwritten objects.
Detailed technical explanation
How to think about this question
Under the hood, S3 event notifications are delivered via SNS, SQS, or Lambda, and the event type is determined by the S3 API operation used. For example, a PUT request (s3:ObjectCreated:Put) can create a new object or overwrite an existing one, so to strictly detect only new objects, developers often combine event filtering with a Lambda function that checks the object's version ID or last-modified timestamp. In real-world scenarios, using s3:ObjectCreated:Put is common for image processing pipelines, but for strict 'new only' logic, additional checks in the Lambda code are necessary.
KKey Concepts to Remember
- S3 Event Notifications
- s3:ObjectCreated:*
- Overwrite behavior
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 Notifications
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.
Review s3 Event Notifications, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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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 — S3 Event Notifications.
What is the correct answer to this question?
The correct answer is: Use s3:ObjectCreated:* — Option A is correct because s3:ObjectCreated:* captures all object creation events, including PUT, POST, COPY, and CompleteMultipartUpload completions. While no S3 event type strictly distinguishes between new object creation and overwrite, using the wildcard ensures all creation events are captured, and additional logic (e.g., checking if the object previously existed) can be implemented in the processing function to filter out updates. In contrast, option C (s3:ObjectCreated:Put) also triggers on PUT operations that overwrite existing objects, so it does not satisfy the requirement to trigger only on new objects.
What should I do if I get this DVA-C02 question wrong?
Review s3 Event Notifications, then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 Event Notifications
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Last reviewed: Jul 4, 2026
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