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？（）

多项选择题 As the DBA， you run the following query on your ASM instance. What is the implication of the results of the query？（） SQL> select group_number， name， state from v$ASM_DISKGROUP；  GROUP_NUMBER NAME STATE  0 DGROUP1 DISMOUNTED  2 DGROUP2 MOUNTED  3 DGROUP3 MOUNTED