多项选择题
A. If you perform a backup across a network， then the backup will reduce the bandwidth.
B. If you perform a backup of a datafile， then the backup will be the same as the operating system copy of the datafile.
C. If you perform a backup of a single datafile， then the control file will not be backed up.
D. The maximum size of each backup set is 10MB
E. The backups will be performed on the disk.
单项选择题 You are maintaining the SALES database of a company. You have never backed up the USERS tablespace that is currently offline. On Sunday， you issued the following commands： CONFIGURE DEFAULT DEVICE TYPE TO sbt； CONFIGURE BACKUP OPTIMIZATION ON； CONFIGURE RETENTION POLICY TO REDUNDANCY 3； From Monday to Saturday， you performed the following actions： Day Action Monday BACKUP DATABASE Tuesday BACKUP DATABASE Wednesday BACKUP DATABASE Thursday BACKUP DATABASE Friday BACKUP DATABASE Saturday BACKUP DATABASE How many times will the backup of the USERS tablespace be performed？（）
单项选择题 Youareperformingabackupofyourdatabaseacrossthenetwork.Whiletakingthebackup，youwanttosavespaceonthestoragemediaandreducethenetworkbandwidth.Whichcommandwillyouissuetoconfiguretherequiredtypeofbackup？（）
单项选择题 You have issued the following command： RMAN>CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 100 DAYS； What will be the result of using the above command？（）
