Which three statements are true concerning unplugging a pluggable database (PDB)?
A.
The PDB must be open in read only mode.
B.
The PDB must be closed.
C.
The unplugged PDB becomes a non-CDB.
D.
The unplugged PDB can be plugged into the same multitenant container database (CDB)
E.
The unplugged PDB can be plugged into another CDB.
F.
The PDB data files are automatically removed from disk.
Explanation:
D: An unplugged PDB contains data dictionary tables, and some of the columns in these encode information in
an endianness-sensitive way. There is no supported way to handle the conversion of such columns
automatically. This means, quite simply, that an unplugged PDB cannot be moved across an endianness
difference.
E (not F): To exploit the new unplug/plug paradigm for patching the Oracle version most effectively, the source
and destination CDBs should share a filesystem so that the PDB`s datafiles can remain in place.
The PDB must be closed before it can be unplugged. When you unplug a PDB from a CDB, the unplugged
PDB is in mounted mode. The unplug operation makes some changes in the PDB’s data files to record, for
example, that the PDB was successfully unplugged. Because it is still part of the CDB, the unplugged PDB is
included in an RMAN backup of the entire CDB. Such a backup provides a convenient way to archive the
unplugged PDB in case it is needed in the future.
Oracle White Paper, Oracle Multitenant