Which of the following architectures is used to support the agent or the application tier？（）

You just completed a manual open database backup. However there seems to be a problem with the database performance. You discover that the database is generating many log switches and the LGWR is consuming lots of CPU time. You have an idea of what the problem is and you begin looking at the information in V$BACKUP and in V$DATAFILE_HEADER. What do you suspect is the problem？（）

A.A
B.B
C.C
D.D

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Examine this statement：  RMAN >BACKUP FORMAT ’ BACKUP df_%d_%s_%p.bus1 DATABASE filesperset = 2；  What state must the target database be in for you to use this RMAN command？（）

A.The target database must be open.
B.The target database must be closed.
C.The target database must be mounted.
D.The target database must be mounted or open.

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