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As DBA for the Rebel Alliance you have decided that you need to facilitate some redundancy in your
database. Using ASM, you want to create a disk group that will provide for the greatest amount of
redundancy for your ASM data (you do not have advanced SAN mirroring technology available to you,
unfortunately).
Which of the following commands would create a disk group that would offer the maximum in data
redundancy?
A. CREATE DISKGROUP dg_alliance1 NORMAL REDUNDANCY failgroup diskcontrol1 DISK ,,
c:\oracle\asm_disk\_file_disk3 NAME file_ diska1 failgroup diskcontrol2 DISK ,,
c:\oracle\asm_disk\_file_disk4 NAME file_ diskb1;
B. CREATE DISKGROUP dg_alliance1 EXTERNAL REDUNDANCY failgroup diskcontrol1 DISK
'c:\oracle\asm_disk\_file_disk3' NAME file_ diska1;
C. CREATE DISKGROUP dg_alliance1 HIGH REDUNDANCY failgroup diskcontrol1 DISK
'c:\oracle\asm_disk\_file_disk1' NAME file_ disk1 failgroup diskcontrol2 DISK '
c:\oracle\asm_disk\_file_disk2' NAME file_ disk2 failgroup diskcontrol2 DISK '
c:\oracle\asm_disk\_file_disk3' NAME file_ disk3;
D. CREATE DISKGROUP dg_alliance1 MAXIMUM REDUNDANCY failgroup diskcontrol1 DISK
'c:\oracle\asm_disk\_file_disk1' NAME file_ disk1 failgroup diskcontrol2 DISK '
c:\oracle\asm_disk\_file_disk2' NAME file_ disk2 failgroup diskcontrol2 DISK '
c:\oracle\asm_disk\_file_disk3' NAME file_ disk3 failgroup diskcontrol2 DISK “First Test,
'c:\oracle\asm_disk\_file_disk4' NAME file_ disk4;
E. None of the above

　　High redundancy is the highest redundancy setting available in ASM,or to the Alliance in 
this case.This will result in a double-mirrored ASM disk group.

注:指定冗余度，有三个选择： HIGH(高度冗余>三路)、 NORMAL(标准冗余--双路)和 EXTERNAL(外
部存储冗余)
存储区域网络(SAN)是一种高速网络或子网络，提供在计算机与存储系统之间的数据传输。
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