Database Management Quizzes for Sixth Form College Year 13 Computer Science

Question 1

Which of the following is not an essential component of a database management system (DBMS)?

Accepted Answer

Operating system

Answer

Data dictionary

Answer

Query processor

Answer

Transaction manager

Question 2

Which of the following is a defining characteristic of a relational database management system (RDBMS)?

Accepted Answer

Data is organized into tables and rows.

Answer

Data is stored in a hierarchical structure.

Answer

Data is accessed using a proprietary query language.

Answer

Data is stored in a flat file format.

Question 3

What is a primary advantage of using a database management system (DBMS) compared to a traditional file-based system?

Accepted Answer

Enhanced data organization and accessibility

Accepted Answer

Reduced data redundancy

Answer

Limited data sharing capabilities

Answer

Reduced data integrity

Question 4

In a relational database table, what's the primary purpose of a primary key?

Accepted Answer

Uniquely identifies each row

Answer

Stores the most important data

Answer

Ensures data consistency between tables

Answer

Speeds up data retrieval

Question 5

Which of the following is NOT a database modeling methodology?

Accepted Answer

Agile development

Answer

Entity-Relationship (ER) modeling

Answer

Hierarchical modeling

Answer

Object-oriented (OO) modeling

Question 6

Which of the following is NOT a core component of a database management system (DBMS)?

Accepted Answer

Data archiving and compression

Answer

Data manipulation and retrieval

Answer

Data storage and management

Answer

Transaction management

Question 7

Which of the following is a disadvantage of normalizing a database?

Accepted Answer

Increased data complexity

Answer

Reduced data redundancy

Answer

Improved data integrity

Answer

Increased database performance

Question 8

Which of the following is NOT an advantage of database normalization?

Accepted Answer

Increased complexity of data structure

Answer

Reduced data redundancy

Answer

Enhanced data accuracy

Answer

Queries that execute more efficiently

Question 9

Which of these is NOT a standard database constraint?

Accepted Answer

Cascade

Answer

Primary key

Answer

Foreign key

Answer

Unique key

Question 10

Which data type is not supported by SQL without additional extensions?

Accepted Answer

Array

Answer

Integer

Answer

Boolean

Answer

String

Question 11

Within a database table, what is the primary purpose of a primary key?

Accepted Answer

Uniquely identifying each row in the table.

Answer

Referencing another table using a foreign key.

Answer

Generating unique values for each row automatically.

Question 12

Which storage approach is commonly used for Big Data due to its scalability and flexible schema?

Accepted Answer

NoSQL databases

Answer

Normalized relational databases

Answer

Hierarchical databases

Answer

Object-oriented databases

Question 13

Which practice is crucial for bolstering database security?

Accepted Answer

Enforce complex, unique passwords for database accounts

Answer

Grant unrestricted access to all database objects

Answer

Store database backups on an unprotected cloud service

Answer

Deactivate firewalls and antivirus software for optimal performance

Question 14

Unlike relational databases, NoSQL databases use a different data model. Which of the following is a typical type of NoSQL database?

Accepted Answer

Document Database

Answer

Relational Database

Answer

Multidimensional Database

Question 15

In an Entity-Relationship Diagram (ERD), which element defines the connections between entities?

Accepted Answer

Relationships

Answer

Entities

Answer

Attributes

Answer

Tables

Question 16

In database design, what's the main purpose of an Entity-Relationship Diagram (ERD)?

Accepted Answer

Visually show and study how entities in a database connect and interact.

Answer

Set the data types and rules for each field in a database table.

Answer

Create a physical version of the database schema directly from the diagram.

Question 17

In database transaction management, what is the primary purpose of the ACID (Atomicity, Consistency, Isolation, Durability) properties?

Accepted Answer

Ensure transactions are processed atomically, consistently, isolated, and stored durably.

Answer

Enhance the user-friendliness of the database system.

Answer

Prevent unauthorized access to data.

Question 18

In data management, what is the main purpose of a database management system (DBMS)?

Accepted Answer

To optimize data handling by efficiently storing, modifying, and retrieving data, improving overall data management effectiveness.

Answer

To solely ensure data security and maintain data integrity within a database system.

Answer

To primarily provide a user-friendly interface that simplifies data interaction and management.

Answer

To exclusively facilitate data exchange between various applications within a network.

Question 19

Which SQL command is used to delete data from a table?

Accepted Answer

DELETE FROM

Answer

INSERT INTO

Answer

SELECT

Answer

UPDATE

Question 20

Which database model is designed to store data in a hierarchical structure, where each parent record can have multiple child records?

Accepted Answer

Hierarchical Model

Answer

Relational Model

Answer

Network Model

Answer

Document Model

Question 21

In Big Data environments, which database type is commonly used to store and manage vast amounts of unstructured or semi-structured data?

Accepted Answer

NoSQL database

Answer

Relational database

Answer

Hierarchical database

Answer

Network database

Question 22

Which of the following is NOT a standard data type in SQL for creating database tables?

Accepted Answer

IMAGE

Answer

INTEGER

Answer

VARCHAR

Answer

BOOLEAN

Question 23

When designing a database schema, which factor is most crucial for ensuring data reliability and validity?

Accepted Answer

Data integrity

Answer

Query speed

Answer

User interface design

Answer

Hardware constraints

Question 24

In database management systems, which constraint ensures that each row in a table can be uniquely identified?

Accepted Answer

Primary key

Answer

Composite key

Answer

Foreign key

Question 25

Which advantages are associated with normalization in database design?

Accepted Answer

Reduced data redundancy

Accepted Answer

Improved data consistency

Answer

Increased data complexity

Answer

Reduced database performance

Question 26

In a database management system, which data modeling technique focuses on representing real-world objects and their connections?

Accepted Answer

Entity-Relationship modeling

Answer

Attribute modeling

Answer

Object-oriented modeling

Answer

Hierarchical modeling

Question 27

What is the primary objective of data normalization in database design?

Accepted Answer

Eliminating data redundancy and ensuring data integrity

Answer

Optimizing database performance for faster data access

Answer

Restricting access to sensitive data for enhanced security

Answer

Creating a visually appealing database diagram

Question 28

Which database design principle aims to minimize data duplication and maintain data accuracy?

Accepted Answer

Normalization

Answer

Denormalization

Answer

Referential Integrity

Question 29

What are the primary responsibilities of a database administrator (DBA) in managing enterprise database systems?

Accepted Answer

DBAs manage database access, ensure data security and integrity, and monitor system performance.

Answer

DBAs are responsible for the physical maintenance and repair of database hardware and software.

Answer

DBAs design and implement database systems but are not involved in their ongoing maintenance.

Answer

DBAs monitor database performance but lack the expertise to implement changes.

Question 30

Which database technology is considered outdated?

Accepted Answer

Hierarchical databases

Answer

In-memory databases

Answer

Graph databases

Question 31

Question: Define referential integrity and explain the mechanisms used to enforce it in a database.

Accepted Answer

Referential integrity ensures valid references between tables, enforced by foreign key constraints.

Answer

Referential integrity ensures data consistency, enforced by primary key constraints.

Answer

Referential integrity ensures data accuracy, enforced by check constraints.

Answer

Referential integrity ensures data security, enforced by user permissions.

Question 32

Which of these is NOT a software-based technique for improving database performance?

Accepted Answer

Upgrading server hardware

Answer

Creating indexes

Answer

Optimizing queries

Answer

Partitioning data

Question 33

In database design, what is the primary purpose of using a surrogate key, and when is it typically employed?

Accepted Answer

To enhance data integrity by replacing non-unique or unstable natural keys.

Accepted Answer

To provide a unique identifier for each row in the table.

Answer

To reduce database size by eliminating redundant data.

Answer

To improve query performance by creating additional indexes.

Question 34

To safeguard sensitive data in a database from unauthorized access, which security measure is most effective?

Accepted Answer

Implementing access control mechanisms like role-based access control (RBAC)

Answer

Employing weak and easily remembered passwords

Answer

Allowing all database users unrestricted access

Answer

Storing all data in a single, unencrypted database table

Question 35

Which of the following is **NOT** a valid data type in SQL?

Accepted Answer

CURRENCY

Answer

INTEGER

Answer

FLOAT

Answer

STRING

Question 36

Which data model arranges data in a tree-like hierarchy?

Accepted Answer

Hierarchical model

Answer

Relational model

Answer

Object-oriented model

Answer

Network model

Question 37

Which SQL command allows data retrieval from a database table?

Accepted Answer

SELECT

Answer

CREATE

Answer

INSERT

Answer

UPDATE

Question 38

Which data type is specifically used to store dates and times in a database?

Accepted Answer

DATE

Answer

INT

Answer

VARCHAR

Answer

BOOLEAN

Question 39

What is the distinction between a primary key and a candidate key?

Accepted Answer

Primary keys are unique, while candidate keys are not

Answer

Candidate keys are unique, while primary keys are not

Answer

There is no difference between primary keys and candidate keys

Answer

Primary keys can accept null values, while candidate keys cannot

Question 40

Which tool is used for designing and modifying database schemas?

Accepted Answer

Database design software

Answer

Entity-relationship diagram

Answer

SQL editor

Answer

Spreadsheets

Question 41

What is the DBA's main duty in managing enterprise database systems?

Accepted Answer

Guarantee the availability, performance, and security of database systems.

Answer

Design and implement new database systems without assistance.

Answer

Create and maintain database applications for users.

Question 42

What is the main difference between a SELECT statement and an UPDATE statement in SQL?

Accepted Answer

SELECT retrieves data while UPDATE modifies data

Answer

UPDATE retrieves data while SELECT modifies data

Answer

They both retrieve data

Answer

They both modify data

Question 43

What is the primary purpose of an index in a database table?

Accepted Answer

To improve query performance

Answer

To enforce data integrity

Answer

To store additional information about the row

Answer

To uniquely identify each row

Question 44

What is the purpose of a database transaction?

Accepted Answer

To ensure data consistency

Answer

To improve query performance

Answer

To store additional information about the row

Answer

To uniquely identify each row

Question 45

Which of the following is NOT a valid data type in SQL?

Accepted Answer

ARRAY

Answer

INTEGER

Answer

VARCHAR

Answer

DATE

Question 46

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

Accepted Answer

To uniquely identify each row

Answer

To store the most critical data

Answer

To enforce referential integrity

Answer

To improve data retrieval speed

Question 47

What is the difference between a database schema and a database instance?

Accepted Answer

The schema defines the logical structure, while the instance is its physical implementation

Answer

The instance defines the logical structure, while the schema is its physical implementation

Answer

They both refer to the same concept

Answer

The schema stores the data, while the instance defines the database structure

Question 48

What is the primary purpose of a database index?

Accepted Answer

To optimize data retrieval speed

Answer

To enforce data integrity

Answer

To store frequently accessed data

Answer

To reduce data redundancy

Question 49

What is the correct syntax to create a database table in SQL?

Accepted Answer

CREATE TABLE (column1 datatype, column2 datatype, ...);

Answer

MAKE TABLE (column1 datatype, column2 datatype, ...);

Answer

BUILD TABLE (column1 datatype, column2 datatype, ...);

Answer

DEFINE TABLE (column1 datatype, column2 datatype, ...);

Question 50

Which operator is used to compare two values for equality in SQL?

Accepted Answer

=

Answer

!=

Answer

<

Answer

>

Question 51

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

Accepted Answer

To uniquely identify each row in the table

Answer

To establish relationships between tables

Answer

To store the most critical data in the table

Answer

To enhance the performance of data retrieval

Question 52

What is the primary role of the Entity-Relationship (ER) model in database design?

Accepted Answer

To depict real-world entities and their interrelationships

Answer

To define the logical structure and organization of the database

Answer

To generate the physical implementation of the database schema

Answer

To optimize the performance and efficiency of the database

Question 53

What is the main purpose of using an index in a database?

Accepted Answer

To significantly speed up data retrieval and access

Answer

To enforce data integrity and maintain data consistency

Answer

To reduce the amount of storage space required for data

Answer

To enhance the security measures and protect data from unauthorized access

Question 54

Explain the fundamental distinction between a Database Management System (DBMS) and a database.

Accepted Answer

A DBMS is the software that manages and controls the database, while the database is the actual collection of data.

Answer

A database is the physical implementation of the DBMS, while the DBMS is the logical design of the data.

Answer

A DBMS is a type of database, while a database is a subset of a DBMS.

Answer

There is no meaningful distinction between a DBMS and a database.

Question 55

To protect databases from threats like unauthorized access, data breaches, and malicious attacks, describe the essential security measures that can be implemented.

Accepted Answer

Enforce strong authentication, encrypt data at rest and in transit, and monitor database activity regularly.

Answer

Grant unrestricted access, store data unencrypted, and ignore software updates.

Answer

Rely solely on antivirus software and firewalls, neglect physical security, and allow uncontrolled remote access.

Question 56

How can database professionals ensure ethical data handling practices?

Accepted Answer

Database professionals can promote ethical data practices by ensuring data accuracy, security, and appropriate use.

Answer

Database professionals have no ethical obligations regarding data handling.

Answer

Ethical concerns in data handling are not the responsibility of database professionals.

Question 57

Select the most appropriate data model for representing data with hierarchical relationships.

Accepted Answer

Network

Answer

Relational

Answer

Entity-Relationship

Answer

Object-Oriented

Question 58

In a relational database, what is the primary purpose of a primary key?

Accepted Answer

To uniquely identify each row of data

Answer

To maintain data integrity

Answer

To establish relationships between tables

Answer

To store the most critical data

Question 59

Which SQL statement is used to create a new table?

Accepted Answer

CREATE TABLE

Answer

SELECT

Answer

INSERT

Answer

UPDATE

Question 60

What is the intended purpose of indexing in a database?

Accepted Answer

To expedite data retrieval

Answer

To enforce referential integrity constraints

Answer

To eliminate data duplication

Answer

To organize data logically

Question 61

Explain the distinction between logical and physical database designs.

Accepted Answer

Logical design focuses on data representation, while physical design focuses on data storage.

Answer

Physical design focuses on data representation, while logical design focuses on data storage.

Answer

Logical and physical database designs are essentially the same.

Answer

Logical design is more critical than physical design.

Question 62

Which database optimization technique does **not** improve query execution speed?

Accepted Answer

Denormalization

Answer

Query optimization

Answer

Indexing

Answer

Data partitioning

Question 63

In a database table, what is the primary purpose of a primary key?

Accepted Answer

To uniquely identify each record in the table

Answer

To link the table to other tables in the database

Answer

To store extra information about a record

Answer

To enforce referential integrity in the database

Question 64

What is the key difference between a SELECT statement and an UPDATE statement in SQL?

Accepted Answer

SELECT retrieves data, while UPDATE modifies data in the database

Answer

Both statements modify data in the database

Answer

Both statements retrieve data from the database

Answer

SELECT modifies data, while UPDATE retrieves data from the database