It should be pretty straightforward. Just shutdown all instances, set cluster_database to false, startup mount, run nid, alter database open reset logs, shutdown, set cluster_database true, and restart all instances. I've done it many times with no problem. -Mark Sent from my iPhone On Nov 24, 2009, at 0:02, "Kumar Madduri" <ksmadduri@xxxxxxxxx<mailto:ksmadduri@xxxxxxxxx>> wrote: Hi We have an underscore in db name and I want to rename it without _. As part of that, I want to use <http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/dbnewid.htm> http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/dbnewid.htm to change the dbname. When I run this utility I am thinking, it would change the db_name references in control file as well and I can still keep the ASM Disk group unchanged. For sid changes, I need to make changes to init.ora ; recreate password files and changes to tnsnames. Is there anything else that I am missing or any additional steps required in a rac database. Thank you Kumar