The answer is to reduce the number of visuals and create summary tables in the data source to pre-aggregate data. Reducing visuals directly improves DirectQuery report performance because each visual sends a separate query to the source database, so fewer visuals mean fewer round trips and less network latency. Pre-aggregating data in the source, such as creating summary tables or using indexed views, offloads heavy computation to the database engine, which is far more efficient than forcing Power BI to aggregate millions of rows on the fly. On the PL-300 exam, this question tests your understanding that DirectQuery performance hinges on minimizing query volume and complexity, and a common trap is thinking that disabling query reduction or adding calculated columns helps—both actually increase the load. Remember the memory tip: “Fewer visuals, faster queries; pre-aggregate to mitigate.”
PL-300 Visualize and analyze the data Practice Question
This PL-300 practice question tests your understanding of visualize and analyze 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 source. Which TWO of the following actions can improve report performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduce the number of visuals on each report page.
Options A and D are correct. A: Reducing the number of visuals decreases the number of queries sent to the source. D: Creating aggregations in the source can speed up query responses. Option B is wrong because using many calculated columns increases query complexity. Option C is wrong because disabling query reduction would increase the number of queries.
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.
✗
Add calculated columns to the model.
Why it's wrong here
Calculated columns can slow down DirectQuery.
✗
Disable the 'Reduce queries sent to the source' option.
Why it's wrong here
This would increase queries.
✓
Reduce the number of visuals on each report page.
Why this is correct
Fewer visuals mean fewer queries.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use complex DAX measures with many nested functions.
Why it's wrong here
Complex measures can degrade performance.
✓
Create summary tables in the data source to pre-aggregate data.
Why this is correct
Pre-aggregation reduces the processing load.
Related concept
Read the scenario before looking for a memorised answer.
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.
Visualize and analyze the data — This question tests Visualize and analyze the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reduce the number of visuals on each report page. — Options A and D are correct. A: Reducing the number of visuals decreases the number of queries sent to the source. D: Creating aggregations in the source can speed up query responses. Option B is wrong because using many calculated columns increases query complexity. Option C is wrong because disabling query reduction would increase the number of queries.
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.
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Question Discussion
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