OBIEE hosting on WebLogic - Admin Server vs. Managed Server

Question

What is the difference between the two possible configurations of WebLogic: Admin Server and Managed Server?
I need to identify which one is adequate to host OBIEE Presentation Services.

Answer 1

http://download.oracle.com/docs/cd/E14571_01/web.1111/e13716/understand_domains.htm#DOMCF115
What Is a Domain?
+An Oracle WebLogic Server administration domain is a logically related group of Oracle WebLogic Server resources. Domains include a special Oracle WebLogic Server instance called the Administration Server, which is the central point from which you configure and manage all resources in the domain. Usually, you configure a domain to include additional Oracle WebLogic Server instances called Managed Servers. You deploy Web applications, EJBs, Web Services, and other resources onto the Managed Servers and use the Administration Server for configuration and management purposes only.+
I added the emphasis on "usually". You will always have exactly one administration server for a domain. That administration server can host other applications, it's simply a question of whether or not it's a good idea to do it. If you need to scale-up your application at a later time so that more than one server would be required - deploying your application to managed servers makes this very easy as you can just add managed servers. Typically other Oracle products in Fusion Middleware have domain templates and other installer / configuration options that default to deploying their infrastructure to managed servers. Sometimes in development / resource-constrained environments people override those defaults and try and run everything on a single Admin Server. It's usually possible, but may not be the most flexible going forward.