What are the steps required to upgrade nimsoft Oracle database from 11g to 12c?
Release : Any version of UIM
Component : UIM - INSTALL
Broadcom does not document 3rd party upgrade processes. There is nothing required from UIM side as part of the upgrade as long as the version of UIM supports the version you are trying to upgrade to.
You can find how to upgrade your database by using your favorite search engine and searching steps to upgrade Oracle from 11g to 12c. This will take you to Oracle's website where they have this documented.