Is Database Connection same as Session?
Ok.. I got some answer from other forums:
That depends entirely on the pool implementation. It seems likely they are associated with an open session for a while, and then the sessions are closed if the connections are not used for some time, and reestablished when they're needed again.
Not keeping them open for some amount of time would mean wasting the overhead of establishing connections when requests are coming in rapid-fire. Keeping them open forever would hog limited resources for no good reason. Both of these go against my understanding of the very point of having a connection pool in the first place.