- A
Standard Workflow
Why wrong: Standard Workflows provide exactly-once execution and can handle long-running processes, but they have lower throughput (max thousands per region) and are not cost-effective for high-volume, short-duration tasks.
- B
Express Workflow
Express Workflows are optimized for high-volume, short-duration executions (under 5 minutes) with at-least-once delivery. They can handle hundreds of thousands of executions per second at a lower cost, making them suitable for this use case.
- C
AWS Lambda function with synchronous invocation
Why wrong: Using Lambda alone would require building complex orchestration logic, retries, and error handling. Step Functions provides built-in state management and parallelism.
- D
Amazon Simple Workflow Service (SWF)
Why wrong: Amazon SWF is a legacy service for orchestrating background jobs. Step Functions is the modern, recommended orchestration service on AWS.
DVA-C02 Development with AWS Services Practice Question
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 serverless application using AWS Step Functions. The workflow must execute hundreds of thousands of short-lived tasks per day, each taking less than 30 seconds. The tasks need to run in parallel, and a small number of duplicate executions are acceptable. Which type of Step Functions workflow should the developer choose?
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
Express Workflow
Express Workflows are designed for high-volume, short-duration (under 5 minutes) event-processing workloads, executing hundreds of thousands of state transitions per second with at-least-once semantics. Since the tasks are short-lived (under 30 seconds), run in parallel, and tolerate a small number of duplicate executions, Express Workflow is the correct choice because it offers lower cost and higher throughput than Standard Workflow, which guarantees exactly-once execution and is better suited for long-running, auditable workflows.
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.
- ✗
Standard Workflow
Why it's wrong here
Standard Workflows provide exactly-once execution and can handle long-running processes, but they have lower throughput (max thousands per region) and are not cost-effective for high-volume, short-duration tasks.
- ✓
Express Workflow
Why this is correct
Express Workflows are optimized for high-volume, short-duration executions (under 5 minutes) with at-least-once delivery. They can handle hundreds of thousands of executions per second at a lower cost, making them suitable for this use case.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Lambda function with synchronous invocation
Why it's wrong here
Using Lambda alone would require building complex orchestration logic, retries, and error handling. Step Functions provides built-in state management and parallelism.
- ✗
Amazon Simple Workflow Service (SWF)
Why it's wrong here
Amazon SWF is a legacy service for orchestrating background jobs. Step Functions is the modern, recommended orchestration service on AWS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Standard Workflow is always the default choice for Step Functions, overlooking the specific requirements for high throughput, short duration, and tolerance for duplicates that make Express Workflow the correct answer.
Detailed technical explanation
How to think about this question
Express Workflows use at-least-once execution semantics, meaning a state transition can be replayed if a failure occurs, which explains why a small number of duplicate executions are acceptable. Under the hood, Express Workflows are executed in a stateless, high-throughput runtime that processes state transitions in memory without persisting intermediate history, enabling up to 100,000 state transitions per second compared to Standard Workflow's limit of 4,000 per second. In a real-world scenario, this is ideal for processing IoT sensor data streams or real-time log aggregation where occasional duplicates are tolerable but cost and latency must be minimized.
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 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.
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: Express Workflow — Express Workflows are designed for high-volume, short-duration (under 5 minutes) event-processing workloads, executing hundreds of thousands of state transitions per second with at-least-once semantics. Since the tasks are short-lived (under 30 seconds), run in parallel, and tolerate a small number of duplicate executions, Express Workflow is the correct choice because it offers lower cost and higher throughput than Standard Workflow, which guarantees exactly-once execution and is better suited for long-running, auditable workflows.
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.
About these practice questions
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Last reviewed: Jun 11, 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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