多项选择题

The database is running in NOARCHIVELOG mode. A data file is lost. Which two are valid options for recover？（）

A.Restore the data file and perform incomplete recovery.
B.Restore the data file and perform point-in-time recover.
C.Drop the tablespace and lose all data in the tablespace.
D.Restore the database and lose all data since the last backup.

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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

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

Which statement is true regarding RMAN components？（）

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.