Connection to Data Base

[Natraj Gudla]

Hi,
I want to use the JDBC drivers and connect to oracle and SQL Server databases , requirement is that i have to connect to them , create a database , create a user who has full rights on that database and then exit...
Is there any default password in oracle that i can use to log in and start my operations , or is it that i need a DBA to assign me a user name and password .
What is the scenario with SQL Server?.