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Fourth Normal Form (4NF) is useful because it addresses multi-valued dependencies, which can lead to redundancy and anomalies in database design. By ensuring that no table contains two or more independent multi-valued facts about an entity, 4NF helps to eliminate data duplication and maintain data integrity. This normalization process improves the efficiency of data retrieval and updates, making databases more manageable and consistent over time. Ultimately, 4NF contributes to a cleaner, more organized database structure that enhances overall performance.

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Why 4NF is more desirable Normal Form than BCNF?

Because 4nf minimize the redundancy as well as make storage management..


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Why 4NF is preferable then bcnf .with example?

Normalization is a process to reduce the redundancy by removing function dependencies BCNF (Boyece code normal form) has all functional dependencies A to B are trivial of discriminator should be superkey. To get relation in BCNF, Splitting the relation schema not neccessarily preserve all functional dependency, Loss less decomposition and dependency are main points for the normalization sometime, it is not possible to get a BCNF decomposition that is dependency, preserving. While 4NF has very similar definition as BCNF. A relational Schema is in 4NF, if all multivalued dependencies A to B are trivial and determinate A is superkey of schema. If a relational schema is in 4nf, it is already in BCNF. and 4NF decomposition preserve the all functional dependency. so 4NF is preferable than to have BCNF.


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