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PostgreSQL Indexing Strategies in 2026: Why Your Database Ignores Your Indexes PostgreSQL Indexing 2026 Deep-Dive May 26, 2026  · 14 min read PostgreSQL Indexing Strategies in 2026: Why Your Database Ignores Your Indexes (And How to Fix It) 👤 Tahar Maqawil — Senior Application Developer & Database Architect Informaticien d'Application · PostgreSQL Specialist · Bioquro 10+ years designing indexes that work — and debugging indexes that don't There is a particular silence in the database when an index exists but the query planner refuses to use it. The application is timing out. The dashboard is red. And somewhere in the PostgreSQL logs, a sequential scan is running on a table with 50 million rows — a table that has an index. The index is there. It was created months ago by a well-meaning engineer who ran a migration. But the query planner has decided, coldly and correctly, that the in...