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A practical guide to the circuit breaker pattern in microservices, including states, thresholds, fallback strategy, common misconfigurations, and production metrics that prevent cascading failures.

The N+1 query problem quietly destroys performance as traffic grows. Learn how to detect it early, fix it safely, and avoid it across popular ORM patterns.

Adding more instances should increase throughput. In practice, shared state, coordination costs, and contention often prevent horizontal scaling from delivering the expected performance gains.

Why timeouts limited waiting but failed to contain system-wide overload, leading to cascading failures under production load.

Adding read replicas is expected to offload the primary database. In practice, coordination costs, consistency guarantees, and hidden coupling can prevent load from moving at all.