Database Normalization: Master Data Integrity and Efficiency

Question 1

Which of the following is a potential drawback of database normalization?

Accepted Answer

Increased data complexity

Answer

Reduced data redundancy

Answer

Improved data integrity

Answer

Increased database performance

Question 2

Which of the following is a potential drawback of database normalization?

Accepted Answer

Increased complexity and difficulty in understanding the database

Answer

Reduced data redundancy

Answer

Improved data integrity

Answer

Increased efficiency of database updates

Question 3

In database normalization, which of the following defines First Normal Form (1NF)?

Accepted Answer

A table with no repeating data groups within rows.

Answer

A table with a primary key that uniquely identifies each record.

Answer

A table with no null values.

Answer

A table without foreign key constraints.

Question 4

The primary objective of database normalization is to:

Accepted Answer

Eliminate redundant data

Answer

Guarantee data accuracy

Answer

Enforce referential integrity

Answer

Optimize query performance

Question 5

A table is deemed First Normal Form (1NF) when:

Accepted Answer

There are no repeating groups of data within rows

Answer

Each row is uniquely identified by a primary key

Answer

All attributes are atomic and indivisible

Answer

The table contains exclusively valid and accurate data

Question 6

Database decomposition, a normalization technique, involves:

Accepted Answer

Splitting a table into multiple tables based on functional dependencies

Answer

Merging multiple tables into a single table

Answer

Clustering data into groups based on similar characteristics

Answer

Denormalizing a database to improve performance

Question 7

Which of the following is NOT a recognized advantage of database normalization?

Accepted Answer

Increased data complexity

Answer

Improved data integrity

Answer

Reduced data redundancy

Answer

Faster query execution

Question 8

A common technique employed in database denormalization is:

Accepted Answer

Adding redundant data

Answer

Removing non-key attributes

Answer

Merging tables

Answer

Splitting tables

Question 9

In a normalized database, what is the primary function of a foreign key?

Accepted Answer

Enforcing referential integrity constraints

Answer

Establishing relationships between data in different tables

Answer

Ensuring data accuracy

Answer

Enhancing query performance

Question 10

What is the preferred approach to handling duplicate data in normalized databases?

Accepted Answer

Eliminate it to the greatest extent possible

Answer

Allow it in specific cases

Answer

It is always acceptable

Answer

Avoid it at all costs

Question 11

For the relation ORDER(OrderID, CustomerID, ProductID, Quantity), what is a candidate key?

Accepted Answer

OrderID, CustomerID

Answer

OrderID

Answer

CustomerID

Answer

ProductID

Question 12

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

Accepted Answer

Increased data security

Answer

Enhanced data integrity

Answer

Reduced data redundancy

Answer

Improved database performance

Question 13

In database normalization, what's the key distinction between lossless and lossy decomposition?

Accepted Answer

Lossless decomposition keeps all data dependencies, while lossy decomposition removes some.

Answer

Lossy decomposition divides relations into smaller groups, while lossless decomposition merges relations.

Answer

Lossy decomposition is not a valid database normalization technique.

Question 14

What is the significance of Boyce-Codd Normal Form (BCNF) in database design? Explain its role in preserving data integrity.

Accepted Answer

BCNF ensures data integrity by eliminating data anomalies and redundancies.

Answer

BCNF is less restrictive than 3NF, allowing for more data redundancy.

Answer

BCNF focuses on reducing data redundancy but does not guarantee data integrity.

Question 15

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

Accepted Answer

Increasing database size

Answer

Eliminating data redundancy

Answer

Ensuring data consistency

Answer

Reducing data access time

Question 16

What is the primary goal of database normalization?

Accepted Answer

To eliminate data redundancy and inconsistencies

Answer

To simplify data accessing

Answer

To enhance data security

Answer

To optimize database performance

Question 17

Which of the following is a key benefit of Boyce-Codd Normal Form (BCNF)?

Accepted Answer

It eliminates all insertion, update, and deletion anomalies

Answer

It simplifies data retrieval

Answer

It significantly improves database performance

Question 18

Consider the following table:

To achieve 3NF, which of the following actions should be taken?

Accepted Answer

Create a separate table for courses with attributes (CourseID, CourseName, InstructorName).

Answer

Remove the InstructorName attribute from the table.

Answer

Add a composite key consisting of StudentID and CourseID.

Question 19

Which of the following is a potential drawback of database normalization?

Accepted Answer

It can result in more complex database structures

Answer

It is only applicable to relational databases

Answer

It can compromise data security

Question 20

In which of the following scenarios would denormalization be a suitable approach?

Accepted Answer

When performance is critical and data redundancy is acceptable

Answer

When the database is small and simple

Answer

When data integrity is the highest priority

Question 21

Which of the following tools is commonly used to assist in identifying and resolving normalization issues?

Accepted Answer

Normalization analyzer

Answer

Data dictionary

Answer

Query optimizer

Question 22

Which of the following is a primary advantage of database normalization?

Accepted Answer

Reduced data redundancy and improved data integrity

Answer

Compromised data accessibility

Answer

Diminished database performance

Answer

Increased data complexity

Question 23

Which of the following scenarios would benefit significantly from database normalization?

Accepted Answer

A database that stores customer information, order history, and product details.

Answer

A database that contains student course grades.

Answer

A database that tracks employee attendance records.

Question 24

What is a potential drawback of excessive database normalization?

Accepted Answer

Increased query complexity and potential performance degradation.

Answer

Elimination of data redundancy.

Answer

Improved data integrity.

Answer

Enhanced data accessibility.