Which command is used to begin a tablespace point-in-time recovery？（）  

单项选择题tablespacepoint-in-timerecoveryispossibleonlywithRMAN.（）

A. True
B. False

单项选择题Ifabackupisexpired，whichofthefollowingistrue？（）

A. It can never be used for a restore/recover operation.
B. Oracle will remove the backup set pieces from the flash recovery area.
C. The backup has been used at least once to restore and recover the database.
D. The backup is no longer valid because of a resetlogs operation.
E. The physical backup set pieces are missing from the media.

多项选择题Whatinformationdoesthereportschemacommandnotprovide？（）

A. Size of the datafiles
B. Size of the tempfiles
C. Date of last backup for datafiles and tempfiles
D. Filenames for each datafile
E. Checkpoint SCN associated with the last RMAN backup

单项选择题Whywouldyouexecutethereportobsoletecommand？（）

A. To list all backups that were no longer available for restore operations
B. To list all backups that had aged beyond the RMAN retention criteria
C. To list all backup set pieces listed in control-file or recovery-catalog metadata that are not on the backup media
D. To list all datafiles that are no longer part of the database and thus do not need to be backed up
E. To list all archived redo logs that are no longer needed for any database recovery

单项选择题Whatistheresultofthiscommand？（）RMAN>Reportneedbackupdays3；

A. Lists all datafiles created in the last three days that are not backed up.
B. Lists all datafiles not recoverable based on the current retention criteria.
C. Lists all datafiles not backed up in the last three days. The datafile is not recoverable. 
D. Lists all datafiles that need to be backed up due to unrecoverable operations.
E. Lists all datafiles not backed up in the last three days. It does not imply that the datafile is not recoverable.