- A
Configure bidirectional cross-filtering between all dimension tables and the fact table.
Why wrong: Bidirectional filtering can create ambiguous paths and slow down performance.
- B
Use multiple inactive relationships between fact and dimension tables to support different analyses.
Why wrong: Inactive relationships require USERELATIONSHIP and complicate measures.
- C
Create a separate date table and mark it as a date table to enable time intelligence functions.
A date table is essential for time-based calculations and filtering.
- D
Use many-to-many relationships between dimension tables and the fact table to simplify the model.
Why wrong: Many-to-many relationships are complex and can lead to incorrect results.
- E
Reduce the cardinality of columns in dimension tables by using surrogate keys instead of natural keys.
Lower cardinality improves compression and query performance.
Quick Answer
The answer is to reduce the cardinality of columns in dimension tables by using surrogate keys instead of natural keys, and to create a separate date table marked as a date table. The first practice minimizes the number of distinct values in join columns, which directly reduces the size of the internal hash tables Power BI builds during query execution, leading to faster compression and more efficient storage. The second practice ensures the engine can leverage built-in time intelligence functions like TOTALYTD, which rely on a continuous, contiguous date range to generate optimized DAX queries without ambiguity. On the PL-300 exam, this tests your understanding of star schema design and data modeling fundamentals, often appearing as a trap where natural keys seem logical but introduce high cardinality that degrades performance. A simple memory tip: keep your keys lean and your dates clean.
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.
A Power BI developer is designing a data model for sales analysis. The model includes a Sales fact table and dimension tables: Product, Customer, Date, and Store. Which TWO design considerations are best practices for optimizing query performance?
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 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
Create a separate date table and mark it as a date table to enable time intelligence functions.
Option C is correct because creating a separate date table and marking it as a date table enables Power BI to use built-in time intelligence functions (e.g., TOTALYTD, SAMEPERIODLASTYEAR) that rely on a continuous, contiguous date range. This design ensures optimal performance by allowing the engine to generate efficient DAX queries and leverage date-based relationships without ambiguity.
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.
- ✗
Configure bidirectional cross-filtering between all dimension tables and the fact table.
Why it's wrong here
Bidirectional filtering can create ambiguous paths and slow down performance.
- ✗
Use multiple inactive relationships between fact and dimension tables to support different analyses.
Why it's wrong here
Inactive relationships require USERELATIONSHIP and complicate measures.
- ✓
Create a separate date table and mark it as a date table to enable time intelligence functions.
Why this is correct
A date table is essential for time-based calculations and filtering.
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 many-to-many relationships between dimension tables and the fact table to simplify the model.
Why it's wrong here
Many-to-many relationships are complex and can lead to incorrect results.
- ✓
Reduce the cardinality of columns in dimension tables by using surrogate keys instead of natural keys.
Why this is correct
Lower cardinality improves compression and query performance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'optimizing query performance' with 'enabling more analysis features'—bidirectional filtering and multiple inactive relationships seem useful but actually harm performance or add complexity, while reducing cardinality with surrogate keys (Option E) is a genuine performance optimization that is easy to overlook.
Detailed technical explanation
How to think about this question
Under the hood, Power BI's VertiPaq engine stores data in columnar compression; marking a date table ensures that time intelligence functions can generate efficient storage and query plans by using a single date column with a known continuous range. A subtle behavior is that if the date table is not marked, time intelligence functions may fail or return incorrect results because the engine cannot guarantee a contiguous date hierarchy. In real-world scenarios, using a separate date table also allows for easy addition of fiscal calendars or custom date attributes without bloating the fact table.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Model the data — study guide chapter
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Model the data practice questions
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FAQ
Questions learners often ask
What does this PL-300 question test?
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: Create a separate date table and mark it as a date table to enable time intelligence functions. — Option C is correct because creating a separate date table and marking it as a date table enables Power BI to use built-in time intelligence functions (e.g., TOTALYTD, SAMEPERIODLASTYEAR) that rely on a continuous, contiguous date range. This design ensures optimal performance by allowing the engine to generate efficient DAX queries and leverage date-based relationships without ambiguity.
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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Last reviewed: Jun 11, 2026
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.
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