Well, my organization decided to replace their existing financial system with Oracle Financials 11i. We are still working through the details (licencing, implementation, etc). We are going 11.5.10 (I hope since I heard that there are some issues with 11.5.9). I have been talking with the implementation DBA (from IBM Consulting) about the architecture required and other technical details. It was suggested that we will need about 300Gb of disk space for each instance of Oracle Appls and we might end up with up to 6 or more instances (demo, dev, test, train, patch, prod, pilot, etc). That's potentially a requirement of 1800Gb of space! Of course, this include the space requirements for the Appl Server too but still, that is kind of ridiculous but when you install Oracle Applications, you install all modules and only those modules that you are licenced are activated.
Another suggestion was to have only one OS account to own both the db and application software which I don't think is best practice so that was rejected and the consultant agreed to two OS accounts (one which will own the DB software and the other owns the application software) and since we will be creating multiple instances, it was suggested that we set up two OS accounts per instance which I am having lots of problems with (e.g. demo instance will have orademo1 and appldemo1 as owners of the db and application software respectively). The reasoning is apparently to avoid confusion as to which instance we are working with. Hmmm...I don't think so but have yet to formulate my disagreement to the consultant.
I think this is going to be one hell of an implementation project and hopefully I can influence key decisions and I am also hoping to get an experienced Oracle Application DBA to come in at key times to do a health check (got to figure out how to sell this to my manager and also to the project team).