Unlike MySQL, PostgreSQL does NOT automatically create indexes on foreign key columns. This means your JOIN queries on user_id, post_id, category_id, etc. are doing sequential scans. Run EXPLAIN ANALYZE on your slow queries — if you see Seq Scan on a table with >10K rows, add a B-tree index. This single oversight causes more production performance issues than any other PostgreSQL mistake.
Sign in to join the conversation.
This insight is user-generated content for informational purposes only. It is not professional advice. Always consult a licensed professional before acting on information related to trades, health, finance, or any field where incorrect application could cause harm. KnowBoar assumes no liability for actions taken based on this content. Full terms.