Oracle : Ошибка ORA-15112

"no diskgroups currently mounted"
*Cause: An ALTER DISKGROUP ALL command did not find any mounted diskgroups
upon which to operate. Either instance shutdown or an ALTER
DISKGROUP ALL DISMOUNT command did not dismount any diskgroups,
or an ALTER DISKGROUP ALL UNDROP DISKS command did not undrop
any disks.
*Action: Mount the diskgroups on which you wish to operate or ignore
the error.

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