- A
Disable retries in the Lambda function to avoid processing duplicates.
Why wrong: Disabling retries would cause data loss if processing fails.
- B
Enable record ordering in the Kinesis stream.
Why wrong: Ordering does not prevent duplicates.
- C
Use a unique identifier for each record and store processed IDs in a DynamoDB table to skip duplicates.
This ensures idempotent processing.
- D
Send the records to an SQS FIFO queue for deduplication.
Why wrong: Kinesis cannot directly send to SQS; this adds complexity and latency.
Question 836 of 1,616
Kinesis Exactly-Once Processing in Lambda
This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 writing a Lambda function that processes records from a Kinesis stream. The function must handle duplicate records and ensure exactly-once processing. Which approach should the developer use?
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 a unique identifier for each record and store processed IDs in a DynamoDB table to skip duplicates.
Option C is correct because exactly-once processing in a Kinesis-triggered Lambda function requires idempotency. By using a unique identifier (e.g., Kinesis sequence number or a business key) and storing processed IDs in a DynamoDB table, the function can check for duplicates before processing each record. This pattern ensures that even if Kinesis delivers the same record multiple times (due to retries or shard rebalancing), the record is only processed once.
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.
- ✗
Disable retries in the Lambda function to avoid processing duplicates.
Why it's wrong here
Disabling retries would cause data loss if processing fails.
- ✗
Enable record ordering in the Kinesis stream.
Why it's wrong here
Ordering does not prevent duplicates.
- ✓
Use a unique identifier for each record and store processed IDs in a DynamoDB table to skip duplicates.
Why this is correct
This ensures idempotent processing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Send the records to an SQS FIFO queue for deduplication.
Why it's wrong here
Kinesis cannot directly send to SQS; this adds complexity and latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse ordering with deduplication, assuming that enabling record ordering (Option B) prevents duplicates, when in fact ordering only ensures records are processed in sequence, not that each record is processed only once.
Detailed technical explanation
How to think about this question
Kinesis Data Streams guarantees at-least-once delivery, meaning the same record can be delivered multiple times to a consumer, especially during shard rebalancing or if the consumer fails and restarts. The DynamoDB-based idempotency store must use strongly consistent reads (or conditional writes with a TTL) to avoid race conditions when multiple Lambda invocations process the same record concurrently. A common real-world scenario is a payment processing pipeline where duplicate charges must be prevented; the unique identifier could be a composite key of shard ID and sequence number.
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 a unique identifier for each record and store processed IDs in a DynamoDB table to skip duplicates. — Option C is correct because exactly-once processing in a Kinesis-triggered Lambda function requires idempotency. By using a unique identifier (e.g., Kinesis sequence number or a business key) and storing processed IDs in a DynamoDB table, the function can check for duplicates before processing each record. This pattern ensures that even if Kinesis delivers the same record multiple times (due to retries or shard rebalancing), the record is only processed once.
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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