OCS Server is
- a database
- a 'Communication Server', set of perl scripts designed to receive inventory and update data in database
- a 'Administrative Console', set of php scripts designed to retrieve informations from database or configure the solution
The three components are totaly imbricated, so you CANNOT change database structure (to an upper version) WITHOUT changing others components.
The only action you can do is upgrade OCS Server. Please search in the wiki how to do it.