- A
Delta Lake provides time travel capabilities for accessing historical data versions.
Delta Lake's time travel feature allows querying previous versions of data.
- B
Parquet is easier to implement for schema evolution than Delta Lake.
Why wrong: Delta Lake supports schema evolution more easily than Parquet.
- C
Delta Lake reduces storage costs by automatically compressing data.
Why wrong: Delta Lake does not automatically compress data; storage costs depend on the underlying file format.
- D
Delta Lake supports ACID transactions, ensuring data consistency during concurrent writes.
Delta Lake provides ACID transactions for reliable concurrent operations.
- E
Parquet files are not natively supported by Azure Databricks.
Why wrong: Azure Databricks natively supports reading and writing Parquet files.
Quick Answer
The answer is Delta Lake, specifically because its ACID transaction support and time travel capability are the two critical factors for batch processing on Azure Databricks. Delta Lake ensures data consistency during concurrent writes through its transaction log, which prevents partial or corrupted writes—a problem that plain Parquet files cannot solve without complex custom logic. Additionally, time travel allows querying previous versions of data by timestamp or version number, enabling rollback and audit trails essential for daily batch jobs. On the DP-203 exam, this question tests your understanding of how Delta Lake’s transaction log differentiates it from Parquet’s static file format; a common trap is assuming Parquet’s compression alone justifies the choice, but the exam emphasizes reliability over storage size. Memory tip: think “Delta logs, Parquet lags”—Delta’s transaction log is what gives it the edge for consistent batch processing.
DP-203 Design and develop data processing Practice Question
This DP-203 practice question tests your understanding of design and develop data processing. 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 data engineering team is designing a batch processing solution using Azure Databricks. The data is stored in Azure Data Lake Storage Gen2 (ADLS Gen2) and must be processed daily with minimal cost. The team needs to choose between using a Delta Lake table or a Parquet file format for the processed output. Which TWO factors should the team consider when making this decision?
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
Delta Lake provides time travel capabilities for accessing historical data versions.
Option A is correct because Delta Lake's time travel feature allows querying previous versions of data using a timestamp or version number, which is essential for auditing, rollback, and reproducing historical reports. This capability is built on the transaction log that tracks every change, making it a key differentiator from plain Parquet files.
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.
- ✓
Delta Lake provides time travel capabilities for accessing historical data versions.
Why this is correct
Delta Lake's time travel feature allows querying previous versions of data.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Parquet is easier to implement for schema evolution than Delta Lake.
Why it's wrong here
Delta Lake supports schema evolution more easily than Parquet.
- ✗
Delta Lake reduces storage costs by automatically compressing data.
Why it's wrong here
Delta Lake does not automatically compress data; storage costs depend on the underlying file format.
- ✓
Delta Lake supports ACID transactions, ensuring data consistency during concurrent writes.
Why this is correct
Delta Lake provides ACID transactions for reliable concurrent operations.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Parquet files are not natively supported by Azure Databricks.
Why it's wrong here
Azure Databricks natively supports reading and writing Parquet files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Parquet is not natively supported in Databricks, but in reality, Parquet is the default storage format for Delta Lake and is fully supported; the key differentiators are ACID transactions and time travel, not format compatibility.
Detailed technical explanation
How to think about this question
Delta Lake's transaction log (stored in the _delta_log directory) records every operation as atomic JSON entries, enabling time travel via version IDs or timestamps. Under the hood, time travel works by reading the transaction log to reconstruct the state of the table at a specific point, then applying only the relevant Parquet data files. In a real-world scenario, if a daily batch job corrupts data, the team can instantly roll back to the previous day's version without restoring from backups.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Design and develop data processing — study guide chapter
Learn the concepts, then practise the questions
- →
Design and develop data processing practice questions
Targeted practice on this topic area only
- →
All DP-203 questions
846 questions across all exam domains
- →
Microsoft Azure Data Engineer Associate DP-203 study guide
Full concept coverage aligned to exam objectives
- →
DP-203 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related DP-203 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Secure, monitor, and optimize data storage and data processing practice questions
Practise DP-203 questions linked to Secure, monitor, and optimize data storage and data processing.
Design and develop data processing practice questions
Practise DP-203 questions linked to Design and develop data processing.
Design and implement data security practice questions
Practise DP-203 questions linked to Design and implement data security.
Monitor and optimize data storage and processing practice questions
Practise DP-203 questions linked to Monitor and optimize data storage and processing.
Design and implement data storage practice questions
Practise DP-203 questions linked to Design and implement data storage.
Develop data processing practice questions
Practise DP-203 questions linked to Develop data processing.
DP-203 fundamentals practice questions
Practise DP-203 questions linked to DP-203 fundamentals.
DP-203 scenario practice questions
Practise DP-203 questions linked to DP-203 scenario.
DP-203 troubleshooting practice questions
Practise DP-203 questions linked to DP-203 troubleshooting.
Practice this exam
Start a free DP-203 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this DP-203 question test?
Design and develop data processing — This question tests Design and develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Delta Lake provides time travel capabilities for accessing historical data versions. — Option A is correct because Delta Lake's time travel feature allows querying previous versions of data using a timestamp or version number, which is essential for auditing, rollback, and reproducing historical reports. This capability is built on the transaction log that tracks every change, making it a key differentiator from plain Parquet files.
What should I do if I get this DP-203 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
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 11, 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.