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 unreachableallocated 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;
Explanation:
Syntax: ALTER DISKGROUP <disk_group_id> CHECK [REPAIR | NOREPAIR];
The check_diskgroup_clause lets you verify the internal consistency of Oracle ASM disk group metadata. The
disk group must be mounted. Oracle ASM displays summary errors and writes the details of the detected errors
in the alert log.
The CHECK keyword performs the following operations:
Checks the consistency of the disk.
Cross checks all the file extent maps and allocation tables for consistently. Checks that the alias metadata
directory and file directory are linked correctly. Checks that the alias directory tree is linked correctly. Checks
that Oracle ASM metadata directories do not have unreachable allocated blocks.