9iAS Portal intsllation question

We are designing the technical architecture for a terabyte size data warehouse. We are proposing and end to end Oracle solution, uing 9iAS Portal for end user access to the warehouse star schema.
Is it required that portal schemas (portal, portal_sso) be installed in the same database as the data warehouse data? If not required, then is it recommended? What are the pros and cons of this approach?

No, it is not required to have the data in the same instance. The recommended approach depends on how you plan to expose the data through the portal. If you are planning on creating web providers/portlets that access and display the data, then it would be better to have the data in a different instance. If you are using Webview components and/or PL/SQL providers, separate instances would require the use of DBLinks which can be problematic from a performance perspective. In that case, it boils down to how much CPU you have on the warehouse instance. The portal requires a significant amount of CPU, so if the machine is already fairly loaded with warehouse activity then the distributed solution is likely to be better.

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