If you don't bother with the data source route but specify (database server) host name, port (default is 1521) and database service name then connections work just fine.
If you do that it looks as if a connection pool with 5 connections is created. Plenty for
testing but one should dig deeper into the pool config if a busy site is anticipated.
Of course, if digging deeper it may be that you want to use a completely different approach to connection pooling anyway because if your web site(s) are already using an oracle database, you would in principle be better of with just one connection pool and not several. But that's way beyond the scope of your question so enough.
