Upgrading a PDB

A CDB can contain zero, one, or more PDBs. You can upgrade one PDB without upgrading the whole CDB. For example, you can unplug a PDB from a release 12.1.0.1 CDB, plug it into a release 12.1.0.2 CDB, and then upgrade that PDB to release 12.1.0.2. You cannot use DBUA to upgrade a PDB, therefore you manually upgrade the PDB.