What are the reasons to avoid using normal forms when designing databases?

Avoiding strict application of normal forms in database design is sometimes justified for several reasons:

• Performance: Excessive normalized design can lead to a large number of JOIN operations, which slow down queries.
• Development simplicity: In some cases, denormalization simplifies application logic and reduces query complexity.
• Domain-specific features: If data rarely changes, redundancy does not lead to consistency problems.
• Reporting and analytics requirements: Sometimes it is more convenient to have denormalized tables for quick access to aggregated data.

For example, in high read-load systems, denormalization is often used to speed up queries despite violating normal forms.