PostgreSQL Performance Optimization

PostgreSQL performance does not get fixed with “a couple of tweaks”; but if you proceed in the right order, you collect quick wins. The right order: measure → confirm with EXPLAIN → apply index/vacuum/application change.

1) Measure: find the top N queries

• pg_stat_statements
• slow query log
• lock wait metrics

2) Read EXPLAIN (ANALYZE, BUFFERS)

EXPLAIN (ANALYZE, BUFFERS)
SELECT ...;

Catch signals such as seq scan, wrong row estimate, sort/hash cost.

3) Index: shaped to the query

CREATE INDEX CONCURRENTLY idx_orders_open_created_at
ON orders (created_at)
WHERE status = 'open';

4) Vacuum/bloat: invisible debt

Autovacuum and long-running transactions noticeably affect performance. If vacuum is unhealthy, disk and index bloat grows.

Conclusion

PostgreSQL performance is a discipline: measurement, correct plan reading, the right index, and a healthy vacuum cycle.