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.
A Power BI developer is designing a semantic model that will be used by multiple departments. The developer wants to ensure that the model follows best practices for performance and usability. Which TWO actions should the developer take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a star schema with dimension and fact tables.
A star schema organizes data into dimension and fact tables, reducing data redundancy and improving query performance by enabling efficient aggregations and filter propagation. This design aligns with Power BI best practices for semantic models, as it minimizes the number of tables and relationships, leading to faster DAX calculations and better compression.
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.
✓
Use a star schema with dimension and fact tables.
Why this is correct
Star schema optimizes query performance and simplifies user understanding.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Hide foreign key columns from report view.
Why this is correct
Hiding key columns prevents confusion and ensures users only see relevant fields.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use calculated columns instead of measures for aggregations.
Why it's wrong here
Calculated columns are static and can increase model size; measures are preferred for dynamic aggregations.
✗
Combine all data into a single flat table to simplify the model.
Why it's wrong here
Flat tables cause poor performance and redundancy.
✗
Enable bidirectional cross-filtering between all tables.
Why it's wrong here
Overuse of bidirectional filtering can lead to ambiguous relationships and performance issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse calculated columns with measures, thinking both are interchangeable for aggregations, or they assume a flat table simplifies the model, ignoring the severe performance penalties in Power BI's columnar storage engine.
Detailed technical explanation
How to think about this question
Under the hood, Power BI's VertiPaq engine compresses data more effectively in a star schema because dimension tables contain low-cardinality, highly repetitive values, while fact tables store numeric measures and foreign keys. Bidirectional cross-filtering creates additional filter context that can lead to Cartesian products or circular dependencies, especially in models with multiple fact tables, increasing query complexity and memory usage.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Use a star schema with dimension and fact tables. — A star schema organizes data into dimension and fact tables, reducing data redundancy and improving query performance by enabling efficient aggregations and filter propagation. This design aligns with Power BI best practices for semantic models, as it minimizes the number of tables and relationships, leading to faster DAX calculations and better compression.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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