Connection pooling is a technique of creating and managing a pool of connections that are ready for use by any thread that needs them. Instead of closing a connection immediately, it keeps them in a pool such that the next connect request could be served very efficiently. Connection pooling, in addition, has a lot of benefits, such as control resource usage.

There is no reason not to use connection pooling when developing Web-based applications, including ZK applications.

The concept of using connection pooling is simple: configure, connect and close. The way to connect and close a connection is very similar the ad-hoc approach, while configuration depends on what Web server and database server are in use.