Database Design Principles: Master the Fundamentals of Database Design

Question 1

In the top-down database design approach, what is the initial step?

Accepted Answer

Conceptual data modeling

Answer

Physical data modeling

Answer

Normalization

Answer

Entity-relationship modeling

Question 2

Which fundamental principle of database normalization aims to eliminate data redundancy?

Accepted Answer

Eliminating data redundancy

Answer

Enhancing data consistency

Answer

Minimizing data storage space

Answer

Improving database performance

Question 3

In an entity-relationship diagram, what symbol signifies a many-to-many relationship?

Accepted Answer

Double diamond

Answer

Rectangle

Answer

Oval

Answer

Single diamond

Question 4

Which data modeling technique is most appropriate for capturing and representing complex data relationships?

Accepted Answer

Object-oriented model

Answer

Hierarchical model

Answer

Network model

Answer

Relational model

Question 5

What is the primary purpose of a primary key in a database table?

Accepted Answer

It uniquely identifies each row in the table

Answer

It enforces referential integrity

Answer

It groups related data together

Answer

It stores the most critical data in the table

Question 6

What is the key difference between logical and physical database design?

Accepted Answer

Logical design focuses on data structure, while physical design focuses on data storage implementation

Answer

Physical design focuses on data structure, while logical design focuses on data storage implementation

Answer

Logical design is independent of the DBMS, while physical design is specific to a particular DBMS

Answer

There is no difference between logical and physical database design

Question 7

Which normal form ensures that all non-key attributes are fully dependent on the primary key and not on any proper subset of the primary key?

Accepted Answer

Third normal form (3NF)

Answer

First normal form (1NF)

Answer

Second normal form (2NF)

Answer

Fourth normal form (4NF)

Question 8

Which of the following is the primary goal of database normalization?

Accepted Answer

Eliminating data redundancy

Answer

Enhancing data performance

Answer

Simplifying data retrieval

Question 9

Which of the following is NOT a benefit of database normalization?

Accepted Answer

Slows down database performance

Answer

Eliminates data redundancy

Answer

Improves data consistency

Answer

Facilitates data update and deletion

Question 10

Which data modeling technique focuses on identifying and representing the relationships between data elements?

Accepted Answer

Conceptual data modeling

Answer

Logical data modeling

Answer

Physical data modeling

Answer

Object-oriented data modeling

Question 11

What is the primary purpose of a primary key in a database table?

Accepted Answer

To uniquely identify each record in the table

Answer

To enforce referential integrity

Answer

To store the most important data in the table

Answer

To create an index for faster data retrieval

Question 12

Which of the following is NOT a step in the typical database design process?

Accepted Answer

Database maintenance

Answer

Requirements gathering

Answer

Conceptual design

Answer

Logical design

Question 13

What is a common technique for boosting database performance?

Accepted Answer

Indexing

Answer

Denormalization

Answer

Adding more tables

Answer

Reducing the number of columns

Question 14

Why is it important to achieve Boyce-Codd Normal Form (BCNF) in database normalization?

Accepted Answer

BCNF ensures that each non-key attribute depends only on the entire primary key, eliminating partial dependencies.

Answer

BCNF helps reduce data redundancy and improve database performance.

Answer

BCNF is less significant in modern database systems due to the popularity of NoSQL databases.

Answer

BCNF is only essential for transactional databases, not for analytical or data warehousing systems.

Question 15

Which of the following is the primary purpose of a primary key?

Accepted Answer

To uniquely identify each row in a table

Answer

To store metadata about the table

Answer

To enforce referential integrity

Answer

To improve query performance

Question 16

Which of the following is the highest normal form?

Accepted Answer

BCNF

Answer

3NF

Answer

1NF

Answer

2NF

Question 17

What is the key benefit of using an entity-relationship diagram (ERD)?

Accepted Answer

Provides a visual representation of entities and their relationships

Answer

Eliminates the need for data normalization

Answer

Can be used to automatically generate a database schema

Question 18

Which of the following is NOT a role of a database administrator (DBA)?

Accepted Answer

Designing and implementing user interfaces

Answer

Optimizing database performance

Answer

Managing database security

Answer

Backing up and recovering data

Question 19

Which of the following is a potential disadvantage of using a star schema?

Accepted Answer

Can result in data redundancy

Answer

Improves query performance

Answer

Supports complex data relationships

Answer

Is easy to understand and maintain

Question 20

Which of the following is a best practice for database design?

Accepted Answer

Normalize data to reduce redundancy and improve data integrity

Answer

Allow null values in columns to represent missing data

Answer

Store data in a single table to simplify data retrieval

Answer

Use complex data types to store a variety of data

Question 21

What is the purpose of a database index?

Accepted Answer

To speed up data retrieval by organizing data in a specific order

Answer

To enforce data integrity

Answer

To reduce data redundancy

Answer

To store metadata about the database

Question 22

Which of the following is NOT a benefit of data normalization?

Accepted Answer

Increased data redundancy

Answer

Reduced data anomalies

Answer

Enhanced data integrity

Answer

Improved data consistency

Question 23

In an entity-relationship diagram (ERD), what does a diamond shape represent?

Accepted Answer

Relationship

Answer

Attribute

Answer

Entity

Answer

Key

Question 24

Which data modeling technique focuses on representing data as entities, attributes, and their relationships?

Accepted Answer

Entity-relationship modeling

Answer

Physical data modeling

Answer

Logical data modeling

Answer

Object-oriented modeling

Question 25

Data anomalies are often caused by:

Accepted Answer

Data redundancy

Answer

Data independence

Answer

Small table sizes

Answer

Well-designed data structures

Question 26

Which of the following is NOT a key characteristic of a well-designed database?

Accepted Answer

Complex data structures

Answer

Efficiency

Answer

Data integrity

Answer

Flexibility

Question 27

The process of converting a logical data model into a physical data model is called:

Accepted Answer

Physical database design

Answer

Data conversion

Answer

Database implementation

Answer

Logical database design

Question 28

Which of the following is a type of data dependency that exists when one attribute determines another attribute?

Accepted Answer

Functional dependency

Answer

Logical dependency

Answer

Structural dependency

Answer

Physical dependency

Question 29

The primary purpose of data modeling is to:

Accepted Answer

Represent and visualize data requirements

Answer

Optimize database performance

Answer

Generate SQL code

Answer

Implement database applications