I am not sure.I have three controlfiles .
Initially will there be 3 controlfiles or what???
Actually my problem is somehow i lost my second controlfile.
i managed to mount the DB by changing the initfile.
but will there be a problem.
or otherwise how to create the second file
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You only actually need 1 control file but typically you have at least 2 (basically because of the problem you have just had). To recreat the corrupt control file simply shut the database down and replace it with one of the other mirrors.
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The reason that 3 copies of the controlfile are used is because it is such an important file. Withou it, you can't start your database.
You can actually start your instance/db with 1 controlfile, but it is recommended that you keep at leaset 3 copies on seperate disks.
To recreate your second controlfile :
Use OS commands to copy controlfile to another destination.
edit your init.ora with paths to all controlfiles(including the one you just created)
Once you have eliminated all of the impossible,
whatever remains however improbable,
must be true.
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