LESSON 3.1
How indexes work
Learn key techniques and workflows in PostgreSQL for Developers.
4m
intermediate
8,204 students
Overview
An index is a sorted structure the planner may choose to use. Column order in a composite index decides which queries it can serve.
In this lesson you will:
- Understand B-tree indexes and column order
- Add partial and expression indexes where they fit
- Weigh the write cost of every index you add
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.