# Denormalization

> A Database keeps a pre-joined copy: reads cost 30% less CPU, and every write costs 20% more.

## Prerequisites

It is a root of the Performance track. Nothing comes before it.

## Engineering terms

- [Denormalization](https://wiki.playquorum.dev/glossary/denormalization.md)
- [N+1 query](https://wiki.playquorum.dev/glossary/n1-query.md)

## Facts

Denormalization
- **Track:** Performance
- **Era:** [Series A](https://wiki.playquorum.dev/eras/series-a.md)
- **Cost:** 2.25k 2.25k
- **Requires:** —

## See also

- [Research tree](https://wiki.playquorum.dev/research.md)

Source: https://wiki.playquorum.dev/research/denormalization