Home > problem-cause-solution > active use of diskgroup “DATA” precludes its dismount

active use of diskgroup “DATA” precludes its dismount


Environment details:

Restore test environment.

HP-UX myhost1 B.11.31 U ia64

Oracle Database 11g Enterprise Edition Release

I want to drop database by drop database command.

Because, my SYSTEM tablespace needs recovery and I am lack of archive logs, I haven’t chance to issue “drop database”.

Further I tried to delete files by RMAN, but it does not work either. Because my controlfile also could not be found. Last resort, I tried flushing ASM disk headers by dd, it does not work either, it still shows DATA diskgroup and ASM disks. And finally I tried to drop disk group…

From asmca and asm command line I get below error message while dropping DATA disk group.



ERROR at line 1:

ORA-15039: diskgroup not dropped ORA-15027: active use of diskgroup “DATA” precludes its dismount


I do not know the real cause, but, as I stated above, it may be because of following reasons:

– lack of controlfile

-SYSTEM tablespace needs media recovery


I managed to drop disk group by:

alter diskgroup data dismount force;
drop diskgroup data force including contents;

Note that, below trials does not work, I got same error message, despite the fact that the database remains closed state.

srvctl stop diskgroup -g DATA
srvctl disable diskgroup -g DATA
srvctl stop asm
  1. mimidatabase
    November 21, 2012 at 2:16 pm

    You can also use the asmcmd ‘lsof’ command to see which file is accessed by which instance.

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