How to multiplex control files?

Control file is small binary file that describes the structure of database.It must be available when database is mounted or opened. To protect against database failures its necessary task to multiplex control files as well as to keep redo log files as a group.Best practice is to maintain one copy on each disk group for automatic storage management (such as +DATA and +FRA) and for file system storage each copy on separate disk is maintained. Control files are multiplexed using following syntax: >shutdown immediate >startup nomount; >alter system set control_files=’/u01/app/oracle/oradata/orcl/control01.ctl’, ‘u02/app/oracle/oradata/ORCL12/control02.ctl’ scope=spfile; I have created control file copy using this but I didn’t created a directory (‘/u02/..’)before hitting this command and it resulted in ORA-00205: Error in identifying controlfile and series of challenges that I faced

ORA-01078: Failure in processing system parameters

LRM-00109: Could not open parameter file

ORA -32001 Write to SPFILE is requested but no SPFILE is in use

Here I fixed one by one-ORA-01078 :
multiplexing controlfiles
recovery of pfile

To create pfile from alert_ORCL11.log file hit below command: > cp alert_ORCL11.log /u01/$ORACLE_HOME/dbs/initORCL11.ora

Next step is remove all the alerts from file and keep only parameters.Here your pfile is recovered

recovery of pfile
multiplexing controlfiles

ORA-32001

multiplexing controlfiles

SPFILE is again created by issuing following command: > create spfile from pfile; Restart is necessary for this as I edited multiple files. > Shutdown immediate;

> startup;

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