Many years ago, I did an internship with the database group at the company where I was working. I still have the printout on installing Oracle, and I remember it being at least 40 pages. There was a lot of voodoo with user accounts and kernel settings.
While I’ve worked with Oracle since, I haven’t been responsible for installing it; things may have become easier. But now, they definitely are easier. From the Amazon Developer Newsletter:
Oracle has produced four publicly-available Amazon EC2 AMIs with pre-installed and configured software for Enterprise, Standard or Express editions. In a matter of minutes, developers can have a fully configured Oracle Database computing environment running on Amazon EC2 that includes the web-based management tool Enterprise Manager Database Control and the web-based rapid development tool Applications Express (APEX).