OID/LDAP installation and configuration involves support from multiple Oracle Support groups
and requires a separate Service Request(SR) for the respective area of support. To answer your
general consultative questions, I recommend your review the following My Oracle Support notes.
These articles provide general information as an alternative option for using OID/LDAP adapters
and a central repository to replace TNSNAMES. Once you start the OID/LDAP installation and
and configuration process, you can address specific questions with the respective group of support.
Starting with Fusion MIddleware(FMW) 11g there is not infrastructure anymore. The database is
created in a standalone home, after that you use RCU (in 10g MRCA) and install FMW 184.108.40.206
References: Doc ID 1073206.1 - Upgrade Planning for Fusion Middleware 11g - FAQ Doc ID 1346624.2 - Information Center: Oracle Internet Directory 11g and later Doc ID 340.1 - Install and Configure Advisor: Oracle Fusion Middleware (FMW) Identity Access Management (OAM, OIM) 11g Doc ID 262.1 - Upgrade Advisor: Oracle Fusion Middleware (FMW) Portal from 10g to 11gR1