Question 815 of 760
DP-203 Develop data processing Practice Question
You are building a data processing solution that requires exactly-once semantics when writing to Azure Event Hubs from Azure Stream Analytics. Which output format should you configure?
⚠ Common exam trap
A common mix-up: candidates assume JSON is the default or most compatible format for streaming outputs, but they overlook that exactly-once semantics require a binary format with embedded schema support, which only Avro provides in this specific Azure Stream Analytics to Event Hubs integration.
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
✓
Avro
Azure Stream Analytics supports exactly-once semantics when writing to Event Hubs only when using Avro serialization. This is because Avro provides a compact binary format with embedded schema, enabling Stream Analytics to track and deduplicate events precisely during output, which is required for exactly-once delivery. JSON, CSV, and Parquet do not support the necessary metadata and checkpointing mechanisms for exactly-once guarantees in this specific integration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
JSON
Why it's wrong here
JSON output does not guarantee exactly-once delivery to Event Hubs.
- ✗
CSV
Why it's wrong here
CSV is not supported for Event Hubs output in Stream Analytics.
- ✗
Parquet
Why it's wrong here
Parquet is not a supported output format for Event Hubs in Stream Analytics.
- ✓
Avro
Why this is correct
Avro format in Stream Analytics provides exactly-once semantics when writing to Event Hubs.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This DP-203 practice question is part of Courseiva's free Microsoft 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 DP-203 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.