What view might you use to try to determine how long a particular backup will take？（）  

单项选择题In what view are you likely to see the following output？（）   SID SERIAL# EVENT SECONDS_IN_WAIT  121 269 RMAN backup & recovery I O 2  129 415 SQL*Net message from client 63 130 270 SQL*Net message from client

A. V$SESSION_EVENT
B. V$SESSION
C. V$WAITS
D. V$WAITSTAT
E. V$SYSSTAT

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.