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Identify two correct statements about multitenant architectures.（）
A:Multitenant architecture can be deployed only in a Real Application Clusters (RAC) configuration.
B:Multiple pluggable databases (PDBs) share certain multitenant container database (CDB) resources.
C:Multiple CDBs share certain PDB resources.
D:Multiple non-RAC CDB instances can mount the same PDB as long as they are on the same server.
E:Patches are always applied at the CDB level.
F:A PDB can have a private undo tablespace.

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出自：Oracle认证

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