单项选择题
A. The backup will not be performed at all.
B. three times
C. four times
D. six times
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？（）
单项选择题 You are maintaining your database in Oracle10g. You want to store the information about the backup of the database in the control file. You issue the following statement： SQL>ALTER SYSTEM SET CONTROL_FILE_RECORD_KEEP_TIME=400； What is the outcome of this statement？ （）