The answer is to reduce the number of rows returned by applying filters early, along with reducing columns selected and using summarized tables. These three actions improve DirectQuery performance by minimizing the volume of data transferred from the source system, as each query in DirectQuery mode sends a native SQL request to the backend database. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your understanding of how DirectQuery differs from Import mode, where performance hinges on reducing query load rather than optimizing an in-memory cache. A common trap is assuming that adding more visuals or calculated columns in DAX will help, but these actually increase query count or processing overhead. To remember the correct trio, think of the "Three Cuts": cut rows early, cut columns, and cut complexity by using pre-summarized tables.
PL-300 Model the data Practice Question
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.
Which THREE actions can improve query performance in a Power BI DirectQuery model?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Limit the columns retrieved from the source.
Reducing columns and rows selected reduces data transfer. Increasing the number of visuals on a page can increase the number of queries, hurting performance. Using summarized tables can reduce the amount of data queried. Creating calculated columns in Power Query (rather than DAX) improves performance because they are materialized at refresh.
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.
✓
Limit the columns retrieved from the source.
Why this is correct
Fewer columns means less data transferred.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create calculated columns in DAX rather than Power Query.
Why it's wrong here
DAX calculated columns are evaluated at query time, hurting performance.
✓
Use pre-aggregated tables in the source.
Why this is correct
Summarized tables reduce the amount of data queried.
Related concept
Read the scenario before looking for a memorised answer.
✓
Reduce the number of rows returned by applying filters early.
Why this is correct
Filtering early reduces data transfer and improves performance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add more visuals to a single page to reduce page count.
Why it's wrong here
More visuals increase the number of queries sent to the source.
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.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which PL-300 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.
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: Limit the columns retrieved from the source. — Reducing columns and rows selected reduces data transfer. Increasing the number of visuals on a page can increase the number of queries, hurting performance. Using summarized tables can reduce the amount of data queried. Creating calculated columns in Power Query (rather than DAX) improves performance because they are materialized at refresh.
What should I do if I get this PL-300 question wrong?
Identify which PL-300 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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO actions are valid for improving query performance in DirectQuery mode?
hard
A.Disable relationship enforcement to speed up joins.
B.Convert the model to Import mode.
✓ C.Create aggregated tables to pre-summarize data.
D.Use calculated columns in the fact table.
✓ E.Reduce the number of columns in the table.
Why C: Option A is correct because reducing columns in the table reduces the data retrieved. Option C is correct because creating summarized tables can reduce data volume. Option B is wrong because disabling relationship enforcement can lead to incorrect results. Option D is wrong because calculated columns often degrade performance in DirectQuery. Option E is wrong because Import mode is not available in DirectQuery.
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.