If All Control file loss or corrupted and you have control file backup by using alter database backup control file to trace command. Then startup database with nomount option and create controlfile from trace file scripts and recover database and open the database.
Step 1 Shutdown database with abort options
SQL> shutdown abort
Step 2 Startup the database with nomount option
SQL> startup nomount
Step3 Create controlfie from trace file backup scripts
Step 3 Recover database
SQL> recover database using backup controlfile;
SQL> recover database using backup controlfile until cancel;
Step 4 Open the database
Step 1 Shutdown database with abort options
SQL> shutdown abort
Step 2 Startup the database with nomount option
SQL> startup nomount
Step3 Create controlfie from trace file backup scripts
Step 3 Recover database
SQL> recover database using backup controlfile;
SQL> recover database using backup controlfile until cancel;
Step 4 Open the database
