Connection Limits: The Hidden Bottleneck of Cloud Auto-Scaling

This technical incident exposes a critical flaw in scaling strategies: on modest cloud infrastructure, database connection limits—not CPU or memory—become the bottleneck that prevents scaling. The article demonstrates how connection pool arithmetic multiplies quickly across processes, workers, and deployments, and why teams often overlook this constraint until infrastructure fails. Understanding this relationship is essential for properly architecting scalable systems and justifies solutions like RDS Proxy.