16 Questions
What is the main goal of normalization in a database?
To eliminate data anomalies
What is one of the problems with extreme normalization in a database?
Complicated data retrieval
Which stage of normalization is described as eliminating repeating groups in database tables?
First normal form (1NF)
What does data redundancy refer to in the context of a database?
Duplication of unnecessary data
What type of anomaly occurs when unnecessary data duplication leads to space wastage?
Insertion anomaly
How does extreme normalization impact the performance of applications that rely on the database?
Hampers the performance
What is the purpose of First Normal Form (1NF)?
To ensure each attribute holds only atomic values
What is the condition for a table to be in the 2nd Normal Form (2NF)?
No non-prime attribute should be dependent on the proper subset of any candidate key
What is the relationship represented by a functional dependency X → Y?
Y is functionally dependent on X
What is a candidate key in a table?
A column that can uniquely identify any database record without referring to any other data
What is the purpose of denormalization in a database?
To optimize the read performance by adding redundant data or by grouping data
In which normal form must each column depend directly on the primary key?
3rd Normal Form (3NF)
What are the concepts based on which the fourth and fifth normal forms were proposed?
Multivalued dependencies and join dependencies
What does a non-prime attribute represent in normalization?
An attribute that is not part of any candidate key
What is the role of functional dependency in normalization?
Representing the relationship when one attribute uniquely determines another attribute
When does a table satisfy the conditions for Third Normalization Form (3NF)?
When it already satisfies the conditions for 2NF.
Test your knowledge about database normalization, the process of organizing data to avoid redundancy and anomalies. Understand the benefits and drawbacks of normalization in database design.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
