Normalization trade-offs
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
know why normalization is the default and what it costs.
Planned topics
- Normalized data stores each fact once: no update anomalies, smaller writes, clear constraints.
- The cost is joins on reads; with good indexes this is usually fine.
- Denormalize only for a measured read problem, not by habit.
- Start from the access patterns: which queries are frequent and slow?
- Keep the normalized tables as the source of truth.
Draft outline details
Demonstration
the Shop order model: orders, order_item, product, with a report query needing four joins and its measured time.
Check your understanding
What is the main risk of storing the same fact in two places?
Show answer
The copies drift apart.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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