多项选择题
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.
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？（）
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？（）
单项选择题 WhichstatementistrueregardingRMANcomponents？（）