Chapter 11: Problem 14

Why is the domain-key normal form (DKNF) known as the ultimate normal form?

Short Answer

Expert verified

Domain-Key Normal Form (DKNF) is considered the ultimate normal form, as it looks to eliminate all possible insertion, deletion, and update anomalies. Unlike other forms, which target specific types of anomalies, DKNF achieves a state where all constraints are a logical result of the domain and key definitions.

Step by step solution

Understand DKNF

Domain-Key Normal Form (DKNF) is a normalization level in databases that seeks to eliminate all insertion, deletion, and update anomalies. A relational database is in DKNF if every constraint on the database is a logical consequence of the definition of keys and domains.

Compare DKNF to other normal forms

There are multiple stages of normalization in databases, each tackling different types of data redundancy and update anomalies. These are 1NF, 2NF, 3NF, BCNF, 4NF, and 5NF (or PJ/NF). With each subsequent form, the restrictions placed on the database become stricter.

Explain DKNF as ultimate normal form

DKNF is often considered the 'ultimate' normal form because it goes beyond handling simple update anomalies. It ensures that each and every constraint on the database is a logical consequence of domain and key definitions, making it a catch-all solution for data redundancy and anomaly issues. In other words, if a database is in DKNF, it avoids all types of update anomalies.

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Why is the domain-key normal form (DKNF) known as the ultimate normal form?

Short Answer

Step by step solution

Understand DKNF

Compare DKNF to other normal forms

Explain DKNF as ultimate normal form

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