I'm not a mainframe guy. I have only worked with enterprise scale Unix (AIX, HPUX, Solaris) deployments. Oracle ERP used by a multi-national manufacturer. SA

I'm not a mainframe guy. I have only worked with enterprise scale Unix (AIX, HPUX, Solaris) deployments. Oracle ERP used by a multi-national manufacturer. SAP ERP used by a different multi-national and also at several government departments. Of course, these systems are also require Oracle RDBMS or IBM DB2. The systems that I have personally worked with have all been in the $5M+ range. But that is just for the software licenses. There also are an army of very well paid consultants tasked with customising the system to the clients requirements. And then there is the enterprise hardware from IBM, HP or Sun (now Oracle).