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Which two statements are true regarding the functionality of the remap command in ASMCMD?（）
A:It repairs blocks that have read disk I/O errors.
B:It checks whether the alias metadata directory and the file directory are linked correctly.
C:It repairs blocks by always reading them from the mirror copy and writing them to the original location.
D:It reads the blocks from a good copy of an ASM mirror and rewrites them to an alternate location on disk if the blocks on the original location cannot be read properly.

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出自：Oracle认证

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