Oracle Exam 1Z0-063 Topic 10 Question 48 Discussion

D: When duplicating a whole CDB or one more PDBs:

You must create the auxiliary instance as a CDB. To do so, start the instance with the following declaration in the initialization parameter file:

enable_pluggable_database=TRUE

A: To duplicate PDBs, you must create the auxiliary instance as a CDB. To do so, start the instance with the declaration enable_pluggable_database=TRUE in the initialization parameter file. When you duplicate one or more PDBs, RMAN also duplicates the root (CDB$ROOT) and the seed database (PDB$SEED). The resulting duplicate database is a fully functional CDB that contains the root, the seed database, and the duplicated PDBs.

References: https://docs.oracle.com/database/121/BRADV/rcmdupdb.htm