Examine the CREATE DISKGROUP command used to create a d

单项选择题

Examine the CREATE DISKGROUP command used to create a disk group:
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

1Z0-053