Which type of database file is spread across all disks in a disk group？（）

单项选择题On the development database rac0， there are six raw devices：  dev raw raw1 through  dev raw raw6.  dev raw raw1 and  dev raw raw2 are 8GB each， and the rest are 6GB each. An existing disk group +DATA1， of NORMAL REDUNDANCY， uses  dev raw raw1 and  dev raw raw2.  Which series of the following commands will drop one of the failure groups for +DATA1， create a new disk group +DATA2 using two of the remaining four raw devices， and then cancel the drop operation from +DATA1？ （）

A.A
B.B
C.C
D.D

单项选择题Whichbackgroundprocesscoordinatestherebalanceactivityfordiskgroups？（）

A. ORBn
B. OSMB
C. RBAL
D. ASMn

单项选择题To reference existing ASM files， you need to use a fully qualified ASM filename. Your development database has a disk group named DG2A， the database name is DEV19， and the ASM file that you want to reference is a datafile for the USERS02 tablespace.  Which of the following is a valid ASM filename for this ASM file？（）

A. dev19/+DG2A/datafile/users02.701.2
B. +DG2A/dev19/datafile/users02.701.2
C. +DG2A/dev19/users02/datafile.701.2
D. +DG2A·701.2
E. +DG2A/datafile/dev19.users.02.701.2

单项选择题HowcanyoureversetheeffectsofanALTERDISKGROUP...DROPDISKcommandifithasnotyetcompleted？（）

A. Issue the ALTER DISKGROUP ... ADD DISK command.
B. Issue the ALTER DISKGROUP ... UNDROP DISKS command.
C. Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.
D. Retrieve the disk from the Recycle Bin after the operation completes.

单项选择题You want to migrate your database to ASM， so you have done a clean shutdown， made a closed backup of the entire You wa database， noted the location of your control files and online redo log files， and changed your spfile to use OMF. The last step is to run an RMAN script to do the conversion.  Using the following steps，what is the correct order in which the following RMAN commands should be executed？（）   1. STARTUP NOMOUNT  2. ALTER DATABASE OPEN RESETLOGS  3. SQL  ALTER DATABASE RENAME ，，logfile1 path TO ，，+dgrp4 ，，  # plus all other logfiles  4. SWITCH DATABASE TO COPY  5. BACKUP AS COPY DATABASE FORMAT ，，+dgrp4 6. ALTER DATABASE MOUNT  7. RESTORE CONTROLFILE FROM ，，controlfile_location

A. 2， 5， 3， 1， 7， 6， 4
B. 1， 7， 6， 5， 4， 3， 2
C. 5， 1， 2， 7， 4， 6， 3
D. 7， 3， 1， 5， 6， 2， 4