Database Not mounting - URGENT

[Kumud]

hi!
I have a database which is stadby. and it suddenly shudown automatically.
I try to start it. It is not mounting. It says can not mount in xclusive mode.
ORA-01102 can not mount database in exclusive mode.
On the same unix box there are two database instance.

when I try to shutdwon other database it says insufficient privilege;

Can any body will guide me.

[SANJAY_G]

It seems som other instance has already mounted the database. If you are not running in parallel mode than try shutting down all the instances and start one by one.

[ac]

Try connecting as internal then bounce the database.

[Kumud]

I have two instances on same machine and it was working fine.
I shut down one database , I can not start it or mount it again becasue it says database can not mounted in exclusive mode.
At a time I am able to start any one database. I do not what setup previos DBA done. It was working fine both the databse

[ggnanaraj]

Shutdown all databases on the UNIX box and do the following...

Check if the shutdown was clean, by seeing if the file sgadef(sid).dbf still exists in u'r $ORACLE_HOME/dbs directory for both instances and remove it.

UNIX 'kill' background processes owned by ORACLE. (kill -9 (process_nos))

Check if any Shared Memory or Semaphores owned by ora(sid) exist and remove them for both instances. (ipcrm -m (shared_memory_nos) & ipcrm -s (semaphore_nos))

Remove lk(sid) from all $ORACLE_HOME/dbs directory for both instances.

Now, Startup the databases.

[Edited by ggnanaraj on 08-11-2001 at 02:40 AM]