The System requirement are related to informatica. Do not provide information on what sizing should be for the system running oracle and hosting repository.
I want to make sure there are no resource contention issues on oracle side and impact the informatica environment.
Sizing of the db server which hosts the repository is depending heavily on the content of the repository.
Things which influence the size are e.g. is the repository versioned or not, is the repository configured for Unicode or not, how much logic is it containing.
Other things which influence the sizing is the load on the Informatica machine (how many jobs will be running concurrently).
Hope this helps
You could search into Velocity for some best practices on this subject.
The below thread refers to several articles from Velocity that look related to your query. The links do not work anymore, though.
There is no default/recommended/exact size for the Repository database. It all depends upon your database/table size.
Hope it helps.