This page describes a minimal installation of OpenACS with PostGreSQL (not Oracle). It will produce a working OpenACS installation in under an hour. It excludes source control, full text search, ssl, managed services (daemontools), DocBook, and qmail.
Install PostGreSQL 7.3.2 from RPM. Select Menu > System Settings > Add/Remove Applications and select Database Server.
After completing installation and restarting the server, go to http://localhost:8000 for configuration and customization instructions. You can upgrade a Quick Install with source control, full text search, backup/recovery, and other production features by walking through the Installation documentation and doing the steps marked OPTIONAL.