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Query Optimization & EXPLAIN

A slow query is a conversation waiting to happen. EXPLAIN ANALYZE tells you what PostgreSQL is actually doing — and more importantly, why. From plan nodes to sequential scans, allow me to walk you through.

1 Your PostgreSQL Query Is Slow. Allow Me to Assist.2 EXPLAIN ANALYZE: A Guided Tour of Your PostgreSQL Query Plan3 Reading PostgreSQL EXPLAIN Output: A Visual Guide4 PostgreSQL Query Plan Nodes: What Each One Means5 PostgreSQL Slow Query Diagnostic Flowchart6 The Hidden Cost of Slow Queries: A Discreet Word About Your Cloud Budget7 Fix PostgreSQL Sequential Scans: When and How to Force Indexes8 The N+1 Query Problem: A Matter Requiring Immediate Attention9 OFFSET Pagination Will Not Scale. Might I Suggest Keyset?10 How to Control PostgreSQL Query Plans with pg_hint_plan11 auto_explain for Production: Safe Setup and Interpretation12 Beyond auto_explain: From Logging Slow Query Plans to Fixing Them
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