Reading EXPLAIN and EXPLAIN ANALYZE Output
Decode PostgreSQL query plans with EXPLAIN to see how the planner executes a query and where the time really goes.
Why Read Query Plans
Before tuning a slow query, see what PostgreSQL actually does. EXPLAIN shows the planner's chosen execution plan as a tree of nodes.
EXPLAIN vs EXPLAIN ANALYZE
EXPLAIN shows estimates only; EXPLAIN ANALYZE actually runs the query and reports real timings and row counts — far more useful for diagnosis.
EXPLAIN ANALYZE
SELECT * FROM orders WHERE customer_id = 42;All lessons in this course
- Understanding Database Performance Basics
- PostgreSQL Architecture Overview
- Basic Query Execution Workflow
- Reading EXPLAIN and EXPLAIN ANALYZE Output