https://oypron.com/tags/performance/Recent content in Performance on Tech Notes - A Developer's JournalHugoen-usMon, 12 Jan 2026 16:30:00 +0000https://oypron.com/posts/postgres-performance-tuning/Mon, 12 Jan 2026 16:30:00 +0000https://oypron.com/posts/postgres-performance-tuning/<p>When somebody hands me a Postgres database and says &ldquo;it&rsquo;s slow,&rdquo; I work through the same checklist almost every time. None of these are exotic. They&rsquo;re the boring, high-leverage things that solve maybe 80 percent of the cases I see before anyone has to think hard.</p> <h2 id="1-explain-analyze-buffers-before-anything-else">1. EXPLAIN (ANALYZE, BUFFERS) before anything else</h2> <p>Theories about why a query is slow are mostly worthless. Run the query with <code>EXPLAIN (ANALYZE, BUFFERS)</code> and read the output.</p>