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Practical Query Tuning in PostgreSQL.pdf
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Practical Query Tuning in PostgreSQL
From Diagnosis to Optimization
PGDay Chicago 2025
April 25, 2025
Keiko Oda - pganalyze
Table of Contents
● Query Tuning Workflow
○ How to find a slow query?
○ Benchmarking with EXPLAIN
● EXPLAIN Refresher
○ Recap basics
● Case 1: Missing Index
○ Statistics, Selectivity and Index
● Case 2: ORDER BY with LIMIT
○ My query got slow without touching it!
● Case 3: Nested Loop with misestimate
○ JOIN types and order
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