Chapter 5: Optimizing Golang Database Connection Pools
Answer-first: Unbounded database connection pools in Go microservices quickly exhaust PostgreSQL processes, triggering severe CPU context switching and memory starvation. The battle-tested production formula requires setting MaxOpenConns dynamically via Little’s Law, matching MaxIdleConns symmetrically to eliminate TCP handshake churn, and placing PgBouncer in transaction pooling mode to multiplex twenty thousand client sockets over sixty database connections. Prerequisite: Advanced understanding of Go concurrency primitives (sync.Mutex, goroutines, context cancellation), PostgreSQL connection process architecture, and TCP socket lifecycle under high connection load is assumed for this chapter. ...