Which two statements are true concerning dropping a pluggable database (PDB)?
A.
The PDB must be open in read-only mode.
B.
The PDB must be in mount state.
C.
The PDB must be unplugged.
D.
The PDB data files are always removed from disk.
E.
A dropped PDB can never be plugged back into a multitenant container database (CDB).
Explanation:
http://docs.oracle.com/database/121/ADMIN/cdb_plug.htm#ADMIN13658
Again here some questions..
B & C make sense because both is a possible solution (nonetheless the question is incomplete and “must” in both answers basically eliminates the other option.
But regarding option E:
How could you plugin in a dropped PDB again? There is basically no way to plugin in the exact dropped database.
You can create an xml manifest before the drop and create a new pdb with the manifest and datafiles.
Or you could backup into an Aux DB and plug the PDB out of there and into your CDB.
BUT: it will never be the dropped PDB which will be plugged “back” in a CDB, because that PDB is dropped aka not existent anymore.
Any thoughts on that one?
BC: The PDB must be in mounted mode, or it must be unplugged
https://docs.oracle.com/database/121/ADMIN/cdb_plug.htm#GUID-6EEAC62B-E7DD-47BA-A62B-1F34B3D9D02E
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