You may want to consider using a different module. Here are a couple of red flags:

• CPAN Testers report no passing tests.
• Here is a quote from the Class::DBI::Loader::Oracle POD: "This module needs a new maintainer, because I no longer use Class::DBI and have no further interest in maintaining this module."

Of course, you are encouraged to fight through these issues and adopt the module as your own. That will require you to understand the Makefile and the Perl source code for the module.