When is it advisable to avoid normal forms when designing a database?

Avoiding the use of normal forms when designing a database is advisable in the following cases:

• Performance requirements: Sometimes, data redundancy (violation of normal forms) allows for faster reading by reducing the number of table joins.

• Simplicity and speed of development: In small projects or prototypes, normalization can be excessive and complicate the structure.

• Lack of complex transactions: If data is rarely updated and mostly read, denormalization may be justified.

• Subject area specifics: For example, in analytics systems (Data Warehouse), denormalized schemas (star schema) are often used to simplify and speed up queries.

Overall, normalization helps avoid redundancy and update anomalies, but in some cases, a compromise in favor of denormalization is justified for performance or convenience.