A.DBWR
B.LGWR
C.SMON
D.PMON

A.v$session
B.v$sysstat
C.v$instance
D.v$database

A.controlfile
B.datafile
C.spfile
D.redolog

A.IMP
B.IMPORT
C.EXP
D.EXPORT

A.DELETE
B.SELECT
C.UPDATE
D.DROP

A.alter system switchlogfile；
B.alterdata base switchlogfile
C.Alter  switchlogfile
D.1和2选项均可以

A.SYSTEM
B.TEMPORARY
C.ROLLBACK
D.USERS

A.smon
B.reco
C.pmon
D.dbwr

A.All_ROWS
B.Cost-basedoptimizer
C.Rule-based optimizer
D.Choose

A.NORMAL
B.ABORT
C.IMMEDIATE
D.NONE

A.ALTER SYSTEM SUSPEND
B.ALTER DATABASE SUSPEND
C.ALTER SYSTEM  QUIESCE  RESTRICTED
D.ALTER SYSTEM OFFLINE