thanks for ur comments.

Yes I claim that I am an OCP(but also a human being). I asked question because I don't have EGO in asking questions.

kindly go thru my question, in that I am also surprised why when I am exporting New oracle sid then why it is showing old one. Because it is showing old sid that is why it is giving error 'oracle already started'.

I just wanted to clear the concept because I am new to Linux and but I have learnt that how to install Oracle and Oracle database in Linux.I know this is small thing for u all but for me i learnt new thing.

Once again I am thankful for ur comments because after reading those, I realized that Yes I can do it my self. But this heppens only because of u all.

and please don't mind in future if ask what is init.ora file(justkiding)

thanks