A complete guide to database connection pooling — how connections work, pool mechanics, HikariCP tuning, pool sizing formulas, failure modes, PgBouncer, RDS Proxy, and production observability. Beginner through senior depth.
Identifying slow queries, profiling tools, key metrics, connection pooling, and practical optimization workflow.
Comprehensive breakdown of failure modes when applications scale from a single server to millions of users — session traps, connection pool exhaustion, replication lag, cache stampede, synchronous HTTP bottlenecks, AI vector scaling, and the architectural judgment rubric based on JavaScript Mastery fundamentals.
