DataSource or ConnectionPoolDataSource for Application Server JDBC resources

Question

When creating JNDI JDBC connection pools in an application server, I always specified the type as javax.sql.ConnectionPoolDataSource. I never really gave it to

Answer 1

My understanding is that only purpose of ConnectionPoolDataSource is to give access to PooledConnection which implements native pooling by JDBC driver. In this case application server can implement connections pooling using this native interface.

When using simple DataSource, appserver uses its own pooling instead of native.

Can't say which approach is best.