[Solved] Which scenario best justifies applying denormalization in a database design? — Ans: When query performance needs improvement by reducing complex joins | SQL

SQL - Database Design and Normalization

Which scenario best justifies applying denormalization in a database design?

AWhen the database size must be kept as small as possible

BWhen minimizing data redundancy is the highest priority

CWhen strict enforcement of data integrity is required

DWhen query performance needs improvement by reducing complex joins

Step-by-Step Solution

Solution:

Step 1: Understand denormalization purpose
Denormalization is used to improve read performance by reducing the number of joins.
Step 2: Analyze options
When query performance needs improvement by reducing complex joins aligns with this purpose. Options B and C relate to normalization goals, and D is unrelated.
Final Answer:
When query performance needs improvement by reducing complex joins -> Option D
Quick Check:
Denormalization trades redundancy for speed [OK]

Quick Trick: Denormalize to speed up reads, not to reduce redundancy [OK]

Common Mistakes:

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