单项选择题
A.Retain the data file backup for 7 days.
B.Run the recover process every 7 days.
C.Destroy the physical backup files every 7 days.
D.Destroy the physical backup files older than 7 days.
E.Retain one backup of each data file for at least 7 days.
F.Keep the catalog information in the control file for 7 days.
单项选择题 You experience a loss of the disk on which the USER_DATA tablespace data files are stored. You attempt to recover the data files but discover that the archived redo log file with sequence number 45， which is needed to perform complete recovery， is invalid. You then begin incomplete recovery-You receive this prompt： ORA-00279：change 309012...03/09/01 11：33：56 needed for thread ORA-00289： suggestion ： /disk1/archive/arch_45.rdo ORA-00280： change 309012 for thread 1 is in sequence #45 Specify log： {=suggested | filename | AUTO | CANCEL} What is the correct response？（）
多项选择题 WhichtwoRMANcommandsinitiatearesynchronizationoftherecoverycatalogwiththetargetdatabasecontrolfile？（）
单项选择题 You issue these LSNRCTL commands： LSNRCTL> SET CURRENT_LISTENER listener01 LSNRCTL> START listener02 What is the result of issuing these commands？（）