单项选择题
A. Put the database in hot backup mode and perform an online backup，including backing up the archived redo logs.
B. Just back up the database datafiles without shutting down the database.
C. You will have to wait until you can shut down the database to perform the backup.
D. Mark each datafile as backup in progress， back them up individually，and then mark them as backup not in progress. No archived redo logs will need to be backed up.
E. Only back up the datafiles that the user will not be touching. Once the user has finished what they were doing，you can shut down the database and back up the datafiles the user changed during the course of the remaining backup
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
单项选择题 You are an Oracle DBA responsible for an ASM instance. The disk controller on your system fails. You suspect that the disk itself is okay. You know it will take 24 hours to replace the controller and you don’t want to have to rebuild the disks from scratch. What do you do？（）
单项选择题 IfyouuseALTERDISKGROUP...ADDDISKandspecifyawildcardforthediscoverystring，whathappenstodisksthatarealreadyapartofthesameoranotherdiskgroup？（）