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單項(xiàng)選擇題
You want to perform the following operations for the DATA ASM disk group：
-Verify the consistency of the disk.
-Cross-check all the file extent maps and allocation tables for consistency. check whether the alias metadata directory and file directory are linked correctly.
-Check that ASM metadata directories do not have unreachable allocated blocks.
Which command accomplishes these tasks（）？
A. ALTER DISKGROUP data CHECK
B. ALTER DISKGROUP data CHECK DISK
C. ALTER DISKGROUP data CHECK FILE
D. ALTER DISKGROUP data CHECK DISK IN FAILURE GROUP 1
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