Follow the steps to Restore A Loss Of Controlfile Using Autobackup:
Step:1 connect to RMAN and view the default parameters using SHOW ALL.
Step:2 see the location of control files.
Step:3 Remove the control file in OS level.
Step:4 start the db in nomount stage and restore the controlfile using autobackup.
Step:5 mount the database and recover it.
Step:6 open the database using resetlogs option.
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