When performing a backup using Recovery Manager （RMAN）， which four types of files can be backed up with the RMAN BACKUP command？（）

多项选择题Your database is functioning in NOARCHIVELOG mode. Your database contains 15 tablespaces. You want to use Recovery Manager （RMAN） to perform backups.  Which two backups would you be able to perform when the database is being accessed by users？（）

A.backup of offline tablespaces
B.backup of read­only tablespaces
C.backup of system­critical tablespaces
D.backup of online， locally managed tablespaces
E.backup of read/write dictionary­managed tablespaces

多项选择题View the Exhibit.  You executed the following command to perform a backup of the USERS tablespace：  RMAN> BACKUP  TABLESPACE USERS  Which three types of files are backed up？ （）

A.password file
B.online redo log files
C.the current control file
D.archived redo log files
E.the current server parameter file
F.all the data files belonging to the USERS tablespace
G.data files belonging to the USERS tablespace and all the default tablespaces

单项选择题View the Exhibit.  You executed the following command to perform a backup of the USERS tablespace： RMAN> BACKUP TABLESPACE USERS  Which type of backup would this command perform？（）

A.backup set
B.image copy
C.incremental backup
D.None; the user receives an error indicating that the backup type must be specified.

单项选择题You execute the following command to perform a backup by using Recovery Manager （RMAN）： RMAN> run  {allocate channel c1 type sbt  backup datafile 1  }  The command errors out. A part of the error message is as follows：  RMAN­03009： failure of allocate command on c1 channel  ORA­19554： error allocating device， device type： SBT_TAPE， device name：  What could explain why the statement failed？（）

A.sbt is not a valid device type.
B.Media Management Library was not loaded.
C.The sbt device cannot be used for data file backups.
D.No path was defined in the ALLOCATE CHANNEL command.
E.The channel is currently being used by another RMAN session.

单项选择题You observe that the senior database administrator always uses the following command when connecting to Recovery Manager （RMAN）， and then starts executing commands to backup the database files：  $ rman target    What would be the effect of this command？（）

A.RMAN would use the current operating system location to place the backup.
B.RMAN would use the control file of the target database to maintain the backup.
C.RMAN would use the recovery catalog of the target database to maintain the backup.
D.RMAN would use the control file of the target database to maintain the backup metadata. 
E.RMAN would use the recovery catalog of the target database to maintain the backup metadata.