Database Connection Pool Lifecycle Under Saturation
UML Sequence Diagrams · made in Skemio
What it shows
- HikariCP/pgx borrows active sockets instead of paying TCP/TLS handshake costs.
- When saturated, threads block on a queue until connectionTimeout triggers.
- Returning a connection resets dirty state without destroying the socket.
The takeaway
Connection pools prevent database exhaustion by buffering thread spikes into controlled queues.
- #database
- #connectionpooling
- #postgresql
- #backend
- #performance
- #systemdesign
