Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?（）<br>A:Place the root container in ARHCHIVELOG mode.<br>B:Take the user data tablespace offline.<br>C:Place the root container in the nomount stage.<br>D:Ensure that HR_PDB is open.

Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?（）
A:Place the root container in ARHCHIVELOG mode.
B:Take the user data tablespace offline.
C:Place the root container in the nomount stage.
D:Ensure that HR_PDB is open.

出自：Oracle认证

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