It is very important that you back up your control file, Bacause the control file records the physical structure of the database,you should make a backup of your control file after making changes to the physical structure of the database. You can create backup of control file by using this statement:
Alter database backup controlfile '/opt/nit/conback.ctl'
You can also backup of a control file to trace file.
Alter database backup controlfile to trace
You backup a control file after any change the physical structure of your database. Such includes as:
- Adding, dropping or renaming datafiles
- Adding or dropping redo log files or group
- Adding or dropping a tablespace
- SHOW PARAMETERS CONTROL_FILES