Some helpful quick notes on R12 and will keep updating in future too.
1. NLS Setting: It is possible to convert from some characters sets to others at a later stage. But there are some exceptions or restrictions.
For example,You can covert the US7ASCII to UTF8, but not from UTF8 to US7ASCII.In this case profile option is set at site-level when you run Rapid install. The language you choose as the base language is used for the language profile. The default settings for date and number formats are derived from the territory profile setting.
2. R12 provides multilingual support for text parts of Oracle applications and for products data. It is because of UTF8 character set, you can if required run a number of languages in a single instance. When you run Rapid install you have an option to choose character set for both the database and the Applications products.
3. Use an alias for host machine when you start Rapid Instal: To use an alias use the -servername command line option with rapidwiz. Here you are not using the actual name of host machine.
$ ./rapidwiz -servername rghost
4. On Primary Application Node should have services enabled :
For Web and Forms Services : Root Service, Web Entry Point Services, Web Application Services, and Other Service Group
For Concurrent Processing Services: Batch Processing Services
5. The Services Explanation are below:
Root Service => Oracle Process Manager (OPMN)
Web Entry Point Services => HTTP Server
Web Application Services => OACORE OC4J,Forms OC4J, OAFM OC4J
Batch Processing Services => Application TNS Listener , Concurrent Managers,Fulfillment Server.
Other Service Group => Oracle Forms Services, Oracle MWA Services
6. In R12 unified APPL_TOP is introduced, the same files are present on each application node.Now service groups that are activated on each node differentiate between application node.
7. Oracle Application access URL in R12 and previous releases.
Default port is 8000.
8. Change the password of users after installations are system,sys,apps,ap,inv etc.
9. Applet in client Browser:Instead of using browser JVM, Sun J2SE Natiave plug-in used by Oracle applcation R12,which is automatically invoked when a user chooses a function that requires it for exmaple running a form.
10. Adclonectx.pl is a perl script that clones the context file.
11. Use of Forms Listener Servlet is the default of Release 12.