PERFORMANCE ENGINEERING
Database connection pooling without the mystery
Why applications open too many connections, how pooling helps, and what to observe before changing configuration.
Connection pooling is a coordination technique: it prevents every request from creating an independent database connection when a smaller managed set can serve the workload.
Why connection counts grow
Web requests, serverless invocations, background tasks, and administrative tools can all create connections. The database may become constrained even when query volume looks modest.
Pool deliberately
A pool should reflect workload, database capacity, transaction duration, and the behavior of the runtime. More connections do not automatically mean more performance.
Observe before tuning
Track connection count, wait time, query duration, errors, and saturation. Tuning without measurements can move the bottleneck instead of removing it.