This PL-300 practice question tests your understanding of model the data. 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.
You are building a Power BI report that uses a DirectQuery connection to a SQL Server database. You need to reduce the amount of data transferred to Power BI when users interact with visuals. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply filters in Power Query to reduce rows
Option B is correct because applying filters in Power Query reduces the number of rows retrieved from the SQL Server database before the data is transferred to Power BI. With a DirectQuery connection, queries are sent to the source each time a visual is interacted with, so reducing the row count at the query level minimizes network traffic and improves report performance.
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.
✗
Increase the query timeout setting
Why it's wrong here
Query timeout affects how long a query can run, not data volume.
✓
Apply filters in Power Query to reduce rows
Why this is correct
Filters in Power Query are pushed down to the source, reducing data transfer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable query reductions
Why it's wrong here
Disabling query reductions would increase data transfer, not reduce it.
✗
Load all data into the Power BI model
Why it's wrong here
Loading all data defeats the purpose of DirectQuery and increases data transfer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing query timeouts or disabling query reductions as performance improvements, when in fact they either do not address data transfer or actively worsen it.
Detailed technical explanation
How to think about this question
Under the hood, DirectQuery translates Power BI visuals into T-SQL queries sent to SQL Server. Applying filters in Power Query (e.g., using WHERE clauses) ensures that only relevant rows are included in the generated SQL, leveraging query folding to push filtering down to the database engine. In real-world scenarios, this is critical for large fact tables (e.g., millions of rows) where unfiltered queries could saturate network bandwidth and degrade user experience.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
Model the data — This question tests Model the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Apply filters in Power Query to reduce rows — Option B is correct because applying filters in Power Query reduces the number of rows retrieved from the SQL Server database before the data is transferred to Power BI. With a DirectQuery connection, queries are sent to the source each time a visual is interacted with, so reducing the row count at the query level minimizes network traffic and improves report performance.
What should I do if I get this PL-300 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 →
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.
This PL-300 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 PL-300 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.