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If you use ALTER DISKGROUP ... ADD DISK and specify a wildcard for the discovery string， what happens to disks that are already a part of the same or another disk group？（）  
A: The command fails unless you specify the FORCE option.
B: The command fails unless you specify the REUSE option.
C: The command must be reissued with a more specific discovery string.
D: The other disks， already part of the disk group，are ignored.

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出自：Oracle认证

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