QUESTION 72
Examine the CREATE DISKGROUP command used to create a diskgroup:
SQL> CREATE DISKGROUP misc EXTERNAL REDUNDANCY
DISK 'ORCL: FRA3' NAME misc1, 'ORCL: FRA4' NAME misc2;
In which situation would you use this method of disk group creation?
A. When two-way disk mirroring is required for the allocation units
B. When three-way disk mirroring is required for the allocation units
C. When using hardware mirroring or RAID
D. When disk mirroring is required for the Automatic Storage Management (ASM) disks
Answer: C
同649题：http://blog.csdn.net/rlhua/article/details/12998439
Explanation/Reference:
Section: Database Architecture & Resource Management, RAC, ASM