I am running Oracle 11gR2 on an AIX box. I did a rename database and change DB ID using NID. I can restart db in a nomount mode, but I can not mount it by the following error.

ORA-01102: cannot mount database in EXCLUSIVE mode
ERROR at line 1:
ORA-01507: database not mounted

I started DB by using a new pfile. I notice that the NID utility did not change the old DB folder names in ASM. So this rename database effort will not be perfect.

I have already removed some easy things when I Googled this error, such as removing the lk* files under $ORACLE_HOME/dbs.

Any suggestions for me to start the database after the renaming command of NID?

Thank you so much!


3 Answers 3


ORA-01102 cannot mount database in EXCLUSIVE mode

Cause: Some other instance has the database mounted exclusive or shared.
Action: Shut down the other instance or mount in a compatible mode.

Find whether you have any running Oracle process.

$ ps -ef | grep smon

Kill the process then try to start again.

Since I dont have the procedure which you have followed to perform DB rename and DBID change I can not say whether there is problem with your procedure.

I would recommend to follow Oracle Knowledge Document to perform such task.
How to Change the DBID and the DBNAME by using NID

  • I believe my mistake was that I used 2nd DB on the same server's control file name in pfile. I hope that bymodifying the control file names in the pfile, I can open the DB. Will post the results later.
    – dave
    Commented Mar 13, 2016 at 5:14

Thanks for JSapkato's response. This made me thinking to find that elusive database instance that prevented me from mounting my database.

It turns out that I made a mistake and used the 1st DB's control file name in the 2nd DB's pfile. I changed the control file names according to the "real" ones in ASM. Now I do not get this "exclusive" mounting errors.

Note: I was following the Oracle document on how to change DB name:



Run given command:

kill -9 ps -e | grep ora_* | awk '{print $1} ###

This will kill all processes associated with oracle, like smon, pmon, dbwriter processes. Then start again with . oraenv & sqlplus / as sysdba

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