单项选择题
A. Create a manual incremental online database backup.
B. Back up all the archived redo logs generated since the 8 a.m. backup.
C. Create a brand-new backup after all the changes have been applied.
D. There is no way to make the changes recoverable based on the 8 a.m. backup.
E. Perform an online backup of the tablespace（s） that contained changed data.
单项选择题 YouwanttoputaspecifictablespacecalledMY_DATAinhotbackupmodesoyoucanbackitup.Whatcommandwouldyouuse？（）
单项选择题 When performing an online backup，what is the proper order of the following steps？（） a. Issue the alter database end backup command. b. Back up the archived redo logs. c. Issue the alter database begin backup command. d. Back up the database files. e. Determine the beginning log sequence number. f. Determine the ending log sequence number. g. Force a log switch with the alter system switch logfile command.
单项选择题 YourdatabaseisinNOARCHIVELOGmode.Youstarttodoabackup，butyouruserscomplainthattheydontwantyoutoshutdownthedatabasetoperformthebackup.Whatoptionsareavailabletoyou？（）