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Which three statements are true concerning the multitenant architecture?（）
A:Each pluggable database (PDB) has its own set of background processes.
B:A PDB can have a private temp tablespace.
C:PDBs can share the sysaux tablespace.
D:Log switches occur only at the multitenant container database (CDB) level.
E:Different PDBs can have different default block sizes.
F:PDBs share a common system tablespace.
G:Instance recovery is always performed at the CDB level.

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出自：Oracle认证

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