单项选择题

You received these error messages because the client cannot find the desired database：  
ORA-12198： TNS：could not path to destination 
ORA-12203： TNS：unable to connect to destination 
Which action would be appropriate in helping to resolve the errors？（）

A.A
B.B
C.C

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单项选择题
Oracle Net Services is composed of several communication layers， known as a stack，which enables clients and database severs to share，modify，and manipulate data. Which reveals the correct architecture，in hierarchical order，of the client-side stack？（）

A.A
B.B
C.C
D.D
单项选择题
WhichstatementistrueregardingRMANcomponents？（）

A.Each target database requires its own recover catalog. 
B.RMAN scripts can be stored in the recovery catalog or the target control file. 
C.A channel is a stream of data to a device type and corresponds to one server session. 
D.The RMAN executable interprets sever session commands and establishes connections to the target database.
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