All DDIC, data and precompiled programs are stored in the repository. Having the DB and one application server on one machine is called a 'central instance'. 40B has over 10K Tables, 13K Indices and over 300K Program objects. 45B comes with 16K Tables and 19K Indices and 440K Program objects. The installation process is somewhat simplified as you need the installation guides and installation CD's in any case for re-installing.
Details are available on request.
For those who want to try an installation on FreeBSD, I would recommend the use of the proper installation tool, R3setup . 140MB or relink oracle on a RH5.2 system. After installing Oracle, the database gets created. Some DB users have to be created, some scripts processed, permissions granted, etc. Next is the DB load with the SAP repository.