A. V$SESSION_EVENTB. V$SESSIONC. V$WAITSD. V$WAITSTATE.……

单项选择题What is the impact of the following backup if it exceeds the duration allowance？（） Backup as compressed backupset duration 2：00 partial minimize load database ；

A. The entire backup will fail.It will not be usable for recovery.
B. The entire backup will failbut any datafile successfully backed up will be usable for recovery.
C. If this backup fails，subsequent backups will prioritize datafiles not backed up.
D. If this backup fails，an error will be raised and any other commands will not be executed. 
E. If this backup fails，no error will be raised and any other commands will be executed.

单项选择题How long will this backup be allowed to run？（）  Backup as compressed backupset duration 2：00 minimize load database

A. 2 minutes
B. 2 hours
C. 2 days
D. The command will generate an error.
E. This backup is not constrained by any time limitation.

单项选择题Ifabackupsetisexpired，whatcanyoudotocorrecttheproblem？（）

A. Change the retention criteria.
B. Make the lost backup set pieces available to RMAN again.
C. Run the crosscheck command to correct the location for the backup set piece contained in the metadata.
D. Nothing. The backup set piece is lost forever.
E. Call Oracle support，their assistance is required.

单项选择题Whatdoesitmeanifabackupisexpired？（）

A. The backup set has exceeded the retention criteria set in RMAN and is eligible for removal. 
B. The backup set has one or more invalid blocks in it and is not usable for recovery.
C. The backup set contains one or more tablespaces no longer in the database.
D. The backup set contains one or more missing backup set pieces.
E. The backup set is from a previous version of RMAN and was not upgraded.

多项选择题Whywouldyourunthedeleteobsoletecommand？（）

A. To remove missing backup set pieces physically from disk
B. To remove metadata related to backup set pieces in the control file and the recovery catalog
C. To mark as deleted records in the control file and the recovery catalog associated with obsolete backup sets
D. To delete backup set pieces associated with backups that are no longer needed due to retention criteria
E. To remove old versions of RMAN backups