Adding an addiotnal controlfile to an OMF/ASM configuration

Question

I ran into a database that is using ASM Diskgroups with OMF. Originally, they only had one location for OMF Redo Logs and control files: DB_CREATE_ONLINE_LOGFILE_DEST_1 (this was the only one set) and it was set to the dskgroup '+FRA'
no problem.
I added a second parameters, DB_CREATE_ONLINE_LOGFILE_DEST_2 ='+SYSTEM' so that they would have multiplxed redo logs in both locations. This worked out create when i added the new log files.
However, there is only 1 controlfile on the system, located in the DB_CREATE_ONLINE_LOGFILE_DEST_1. Is there a simple way to tell the database to create a copy of the current controlfile into DB_CREATE_ONLINE_LOGFILE_DEST_2?
With regular , non OMF systems, we would just copy the current fle to the new location and edit the init.ora params (and/or spfile). OMF does not permit this type of copy operation.
Any thoughts?

Answer 1

Yes, It should work logically, I dont have any way to test it.
Recently, we moved whole database from local file system to SAN. At that time, First steps were as follow.
Take a backup of control file to trace before you follow as below.
a.     Following commands are needed so that RMAN knows by default where to write its backups and where to create new online log and data file.
alter system set db_create_file_dest='+ASM','+SYSTEM' scope=spfile;
NOTE: If not using spfile than change this parameter into pfile manually.
----- NOW TAKE A BACKUP OF YOUR EXISTING CONTROL FILE USING RMAN COMMAND ----
**** Follwoing steps only required if you want to move control file *****
Following command reset the CONTROL_FILE location to null. Once CONTROL_FILES is reset the DB_CREATE_FILE_DEST parameter becomes the location where new control files are created.
alter system reset control_files scope=spfile sid='*';
NOTE: If not using spfile than change this parameter into pfile manually.
b.     Shutdown database cleanly.
Shutdown Immediate;
startup nomount;
NOTE: if not using spfile than, STARTUP NOMOUNT PFILE='pfile location'
2.     Connect to RMAN, backup and switch database
rman target /
a.     restore controlfile from old location.Following command causes RMAN to copy the specified source controlfile into both of your disk group disk group. This will copy a control file into DB_CREATE_FILE_DEST location specified in spfile/pfile.
     restore controlfile from 'old_location';
b.     Mount database
     ALTER DATABASE MOUNT;
c. Open database
     sql 'alter database open';
I hope this would help you
Thanks
~Keyur
Message was edited by:
Keyur Patel