Oracle licensing for Windchill

Hi Fellow Windchillers/Oracle DBA's/System administrators:

Want to upgrade to Windchill9.1M070 from 8.0M030 which
currently has Oracle9i.

Is the licensing based on the no. of cores which the server
has?  If we want to have test server and
production server as 2 separate virtual machines on a 4 core HP-UX server how
will be charged?

Cheers!!

~Amol

Silicon Meadows Design Limited Pune-India