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Welcome to the Principles of Dimensional Modeling MCQs Page

Dive deep into the fascinating world of Principles of Dimensional Modeling with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Principles of Dimensional Modeling, a crucial aspect of Data Warehousing and OLAP. In this section, you will encounter a diverse range of MCQs that cover various aspects of Principles of Dimensional Modeling, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Data Warehousing and OLAP.

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Check out the MCQs below to embark on an enriching journey through Principles of Dimensional Modeling. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Data Warehousing and OLAP.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Principles of Dimensional Modeling. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Principles of Dimensional Modeling MCQs | Page 4 of 8

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Q31.
In a STAR schema, how do users analyze data?

a.

By directly querying the fact table

b.

By using only the dimension tables

c.

By creating complex data models

d.

By ignoring dimension tables

Discuss
Answer: (a).By directly querying the fact table Explanation:Users in a STAR schema analyze data by querying the fact table and combining it with dimension tables.
Q32.
Which department would benefit the most from using a STAR schema for data analysis?

a.

Human resources

b.

Accounting

c.

Marketing

d.

IT

Discuss
Answer: (c).Marketing Explanation:The marketing department is often one of the main beneficiaries of STAR schema for analyzing data.
Q33.
What is the primary function of the primary key in a dimension table?

a.

It contains textual attributes

b.

It uniquely identifies each row

c.

It stores numerical values for calculations

d.

It is used to normalize the table

Discuss
Answer: (b).It uniquely identifies each row Explanation:The primary key in a dimension table serves to uniquely identify each row in the table.
Q34.
Why is a dimension table referred to as "wide"?

a.

It has many rows

b.

It is large in size

c.

It contains numerical values

d.

It has many columns or attributes

Discuss
Answer: (d).It has many columns or attributes Explanation:A dimension table is called "wide" because it typically contains many columns or attributes.
Q35.
What type of attributes are commonly found in dimension tables?

a.

Numerical attributes

b.

Descriptive or textual attributes

c.

Primary keys

d.

Normalized attributes

Discuss
Answer: (b).Descriptive or textual attributes Explanation:Dimension tables primarily contain descriptive or textual attributes that represent textual descriptions of business dimensions.
Q36.
Why are dimension tables typically not normalized?

a.

To make them more efficient for query performance

b.

To allow for direct relationships with other tables

c.

To reduce the number of records in the table

d.

To add more columns and attributes

Discuss
Answer: (a).To make them more efficient for query performance Explanation:Dimension tables are not normalized to optimize query performance by allowing direct relationships with other tables.
Q37.
How do attributes in a dimension table facilitate drilling down and rolling up in data analysis?

a.

They enable complex calculations

b.

They restrict the types of queries that can be performed

c.

They provide multiple hierarchies for different queries

d.

They contain only numerical data

Discuss
Answer: (c).They provide multiple hierarchies for different queries Explanation:Attributes in a dimension table provide multiple hierarchies, allowing users to drill down to lower levels of details or roll up to higher levels of aggregation.
Q38.
What is the typical relationship between the number of records in a dimension table and the fact table in a data warehouse?

a.

They have roughly the same number of records

b.

The fact table has fewer records than the dimension table

c.

The dimension table has fewer records than the fact table

d.

The number of records varies depending on the business

Discuss
Answer: (c).The dimension table has fewer records than the fact table Explanation:Dimension tables typically have fewer records or rows than the fact table in a data warehouse.
Q39.
What is the primary key of a fact table?

a.

The concatenation of primary keys from dimension tables

b.

The date of the transaction

c.

The total number of records in the table

d.

The name of the product

Discuss
Answer: (a).The concatenation of primary keys from dimension tables Explanation:The primary key of a fact table is formed by concatenating the primary keys of the associated dimension tables.
Q40.
What does the term "data grain" refer to in the context of a fact table?

a.

The size of the table in terms of storage space

b.

The level of detail for the measurements or metrics

c.

The number of columns in the table

d.

The primary key of the fact table

Discuss
Answer: (b).The level of detail for the measurements or metrics Explanation:Data grain refers to the level of detail for the measurements or metrics stored in the fact table.
Page 4 of 8

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