Hi Sreenivash, I had the same question eight years ago when I was mechanical engineering graduate (that time all I knew was fotran) ;-) Standard Oracle database is not yet intelligent enough to talk directly to hardware (harddisk, memory, keyboard, mouse....) . It uses operating system to communicate to hardware component and store data persistently so O.S. is very much required. Regards Atul Kumar http://teachMeOracle.com/forum http://becomeAppsDBA.blogSpot.com Hi DBAs... I am open to learning..I have a silly question to put forth... I am not very clear about the relation between Operating System and Oracle...Is it necessary to have OS to install oracle and create a database.. Can anybody kindly take the pain to help me out........... Thanks in advance Sreenivash. Atul Kumar Site Dedicated to Apps DBA's Forum Dedicated to Apps DBA's