I have an Oracle 11gR2 EE Database on Windows 2008 R2 Server. There is no RAC, and the size of database is 55 GB. I would like to migrate this Database to Oracle 12cR1 EE as a pluggable database on Windows 2012 R2. Nothing (data, users, permissions, tablespaces etc.) should change.
What is the best and painless way to do this? Could you please provide me necessary directions as well as documentation?