MySQL + SQL · Lesson 29

Denormalization in Database Design

What is Denormalization?

Denormalization is intentionally adding some redundancy back into a normalized database to make reads faster. It trades storage and update-complexity for query speed.

Why Denormalize?

  • Fewer joins → faster SELECT queries.
  • Good for reporting/dashboards that read a lot.
  • Used when read speed matters more than perfect normalization.

The Trade-off

Denormalization speeds up reads but makes updates harder (you must update the duplicated data in several places) and uses more storage.

Summary

  • Denormalization adds controlled redundancy for faster reads.
  • Trade-off: faster SELECTs but harder updates and more storage.
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