LESSON 3.2
Reading EXPLAIN ANALYZE
Learn key techniques and workflows in PostgreSQL for Developers.
10m
intermediate
7,590 students
Overview
The plan tells you what the database did and what it expected. A large gap between estimated and actual rows is usually the real problem.
In this lesson you will:
- Read a plan from the innermost node outwards
- Spot sequential scans that should be index scans
- Compare estimated against actual row counts
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.