This is an architecture diagram of Oracle9iAS Release 2 (9.0.2). Four hosts are shown. Host 1 shows J2EE and WebCache and Portal and Wireless install types. It accesses the Oracle9iAS Metadata Repository on Host 3, which also contains Oracle9iAS Single Sign-On, Oracle Internet Directory, and Oracle Management Server.
The Business Intelligence and Forms and Unified Messaging install types are shown on Host 2. Host 4 houses the Oracle9i database, which is accessed by Unified Messaging and the Oracle Management Server.