← Exit to Module 15: Database Access lessons
Module progress · 0%Lesson · 14 min
Module 15: Database Access
Lesson focusConnection Pooling Essentials
Reuse expensive database connections using a pool such as HikariCP.
01 · 18 minJDBC FundamentalsLocked02 · 14 minConnection Pooling EssentialsLocked03 · 20 minTransactions & Isolation LevelsLocked04 · 20 minJPA & Hibernate BasicsLocked05 · 18 minEntity Relationships & CascadingLocked06 · 35 minMini-Project: Simple CRUD ServiceLocked
Opening connections repeatedly is slow—pools keep a warm set available.
Tune max/min pool sizes based on DB capacity and application throughput.
Always close connections promptly so they return to the pool; leaks exhaust DB resources.