Question 496 of 851

Design and develop data processing →hardMultiple ChoiceObjective-mapped

Why ADF Copy Activity Copies Zero Rows Despite Reading Millions

This DP-203 practice question tests your understanding of design and develop data processing. 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. 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.

Network Topology

Refer to the exhibit. A data engineer notices that the copy activity sometimes copies 0 rows despite reading 1 million rows. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Network Topology

A
The source table is being updated between pipeline runs, but the copy activity is not configured to upsert.
Why wrong: This option is incorrect because if the source table is updated but the copy activity is not configured for upsert, it would still copy all 1 million rows (append or overwrite), not 0 rows.
B
The source query includes a 'WHERE' clause that filters out all rows on alternate runs.
This option is correct. An incremental load pattern uses a WHERE clause (e.g., WHERE LastModified > @{pipeline().parameters.lastRun}) that returns zero rows when no changes have occurred, resulting in 0 rows copied despite the source having 1 million rows.
C
The pipeline is using a full load each time, overwriting the sink, so the second run sees the same data and skips because the sink already has it.
Why wrong: This option is incorrect. A full load with overwriting would still copy all 1 million rows to the sink; it does not skip rows because the sink already has the data. 0 rows would not occur in this scenario.
D
The sink is a file system that fails to write due to permission issues.
Why wrong: This option is incorrect. Permission issues would typically cause the copy activity to fail with an error, not silently copy 0 rows.

Full breakdown with real-world context →

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

✓

The source query includes a 'WHERE' clause that filters out all rows on alternate runs.

In Azure Data Factory, the copy activity can be configured for incremental loads by using a source query with a WHERE clause that filters rows based on a watermark (e.g., last modified timestamp). On pipeline runs where no new or updated rows exist in the source table, this WHERE clause will return zero rows. Although the source table contains 1 million rows, the incremental filter causes the copy activity to read and write 0 rows. This is the most likely cause of the described behavior.

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.

✗
The source table is being updated between pipeline runs, but the copy activity is not configured to upsert.
Why it's wrong here
This option is incorrect because if the source table is updated but the copy activity is not configured for upsert, it would still copy all 1 million rows (append or overwrite), not 0 rows.
✓
The source query includes a 'WHERE' clause that filters out all rows on alternate runs.
Why this is correct
This option is correct. An incremental load pattern uses a WHERE clause (e.g., WHERE LastModified > @{pipeline().parameters.lastRun}) that returns zero rows when no changes have occurred, resulting in 0 rows copied despite the source having 1 million rows.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pipeline is using a full load each time, overwriting the sink, so the second run sees the same data and skips because the sink already has it.
Why it's wrong here
This option is incorrect. A full load with overwriting would still copy all 1 million rows to the sink; it does not skip rows because the sink already has the data. 0 rows would not occur in this scenario.
✗
The sink is a file system that fails to write due to permission issues.
Why it's wrong here
This option is incorrect. Permission issues would typically cause the copy activity to fail with an error, not silently copy 0 rows.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Scenario analysis trap
This option is incorrect. A full load with overwriting would still copy all 1 million rows to the sink; it does not skip rows because the sink already has the data. 0 rows would not occur in this scenario.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which DP-203 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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.

10 questions 20 questions 30 questions 50 questions Timed 30

DP-203 practice-test guide →Study guide →Browse all practice tests

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: The source query includes a 'WHERE' clause that filters out all rows on alternate runs. — In Azure Data Factory, the copy activity can be configured for incremental loads by using a source query with a WHERE clause that filters rows based on a watermark (e.g., last modified timestamp). On pipeline runs where no new or updated rows exist in the source table, this WHERE clause will return zero rows. Although the source table contains 1 million rows, the incremental filter causes the copy activity to read and write 0 rows. This is the most likely cause of the described behavior.

What should I do if I get this DP-203 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

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.

Loading comments…

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.