Database Design Principles: Master the Fundamentals of Data Integrity and Performance

Question 1

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

Accepted Answer

To uniquely identify each record in the table and enforce data integrity

Answer

To store metadata about the table

Answer

To optimize data retrieval performance

Question 2

Which data modeling technique is used to represent the relationships between entities as lines connecting objects?

Accepted Answer

Entity-Relationship (E-R) Model

Answer

Relational Model

Answer

Object-Oriented Model

Answer

Hierarchical Model

Question 3

What is the main objective of data integrity in database design?

Accepted Answer

To ensure the accuracy, consistency, and validity of data

Answer

To improve data storage efficiency

Answer

To enhance data retrieval performance

Question 4

Which type of constraint maintains the referential integrity of a database by ensuring that foreign key values correspond to existing primary key values in related tables?

Accepted Answer

Referential Integrity Constraint

Answer

Not Null Constraint

Answer

Unique Constraint

Answer

Primary Key Constraint

Question 5

What is the primary goal of database performance optimization?

Accepted Answer

To minimize query execution time and improve overall database responsiveness

Answer

To enhance data security

Answer

To reduce data storage requirements

Question 6

Which type of index is specifically designed to accelerate data retrieval based on queries that specify a range of values?

Accepted Answer

Range Index

Answer

Full-Text Index

Answer

Hash Index

Answer

Bitmap Index

Question 7

What is the purpose of a data dictionary in the context of database design?

Accepted Answer

To provide comprehensive documentation of the database's structure, relationships, and constraints

Answer

To manage user access to the database

Answer

To store performance statistics for database optimization

Question 8

Which database design principle focuses on eliminating redundant data and maintaining data consistency?

Accepted Answer

Normalization

Answer

Data Integrity

Answer

Denormalization

Question 9

What is the primary responsibility of a transaction in database management systems?

Accepted Answer

To ensure that database modifications are performed atomically, consistently, isolated, and durably (ACID)

Answer

To manage user access permissions

Answer

To optimize data retrieval performance

Question 10

What is the primary purpose of a foreign key constraint?

Accepted Answer

To ensure referential integrity by preventing orphan records

Answer

To enforce data type consistency

Answer

To prevent duplicate data

Answer

To improve database performance

Question 11

Which database design principle is primarily focused on reducing data duplication and inconsistency?

Accepted Answer

Normalization

Answer

Atomicity

Answer

Isolation

Question 12

What is a key benefit of using an Entity-Relationship (ER) diagram in database design?

Accepted Answer

Provides a visual representation of the database structure and relationships between entities

Answer

Improves data access speed

Answer

Automatically generates the database schema

Answer

Reduces data entry errors

Question 13

Which data type is commonly used for storing dates and times in a database?

Accepted Answer

DATETIME

Answer

FLOAT

Answer

VARCHAR

Answer

INT

Question 14

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 store additional information about the record

Answer

To enforce data integrity

Answer

To improve database performance

Question 15

Which database design principle ensures that transactions are completed in their entirety or not at all, preventing partial updates?

Accepted Answer

Atomicity

Answer

Durability

Answer

Concurrency

Answer

Isolation

Question 16

What is the main advantage of creating an index on a database table?

Accepted Answer

Enhancing data retrieval speed by providing a faster way to locate specific records

Answer

Preventing data duplication

Answer

Reducing storage space requirements

Answer

Enforcing data integrity constraints

Question 17

What is a key advantage of using a relational database management system?

Accepted Answer

Ability to represent and manage data with complex relationships between different entities

Answer

Reduced storage requirements

Answer

Faster data processing capabilities

Answer

Improved data security measures

Question 18

Which data modeling technique emphasizes the relationships between entities and their attributes?

Accepted Answer

Entity-Relationship Model

Answer

Hierarchical Model

Answer

Relational Model

Answer

Network Model

Question 19

What database principle ensures data remains consistent and accurate across multiple tables?

Accepted Answer

Data Integrity

Answer

Data Normalization

Answer

Data Redundancy

Answer

Data Security

Question 20

Which type of database key uniquely identifies each row in a table?

Accepted Answer

Primary Key

Answer

Candidate Key

Answer

Foreign Key

Answer

Super Key

Question 21

What is the main purpose of a foreign key constraint in a database?

Accepted Answer

To maintain referential integrity between related tables.

Answer

To prevent duplicate data entries.

Answer

To improve database performance.

Question 22

What is the primary goal of database performance optimization?

Accepted Answer

To enhance the speed of data retrieval and update operations.

Answer

To reduce data storage requirements.

Answer

To facilitate data manipulation.

Answer

To improve data security.

Question 23

Which database management system is renowned for its scalability and open-source nature?

Accepted Answer

MySQL

Answer

SQL Server

Answer

IBM DB2

Answer

Oracle

Question 24

What is the primary responsibility of a database administrator (DBA)?

Accepted Answer

To manage and maintain database systems.

Answer

To provide technical support to database users.

Answer

To use databases for data analysis.

Answer

To design and develop databases.