Difference between Oracle Apps 11i and R12 (Technical)

Major technical difference: - 

Database:
Database Version in 11i (11.5.9 & 11.5.10) was 9i Rel 2 where as in Release 12 its 10g R2 (10.2.0.2)

Application Tier:Tech Stack in Application Tier consist of iAS(1.0.2.2.2) & Developer 6i (Forms & Reports 8.0.6) but in Applications R12 it is build on Fusion Middleware (10g Web Server and 10g Forms & Reports)

Sub component in Application TierA) HTTP Server or Web Server in R12 is Version 10.1.3 which is built on Apache version 1.3.34. In apps 11i it is Version 1.0.2.2.2 built on Apache Version 1.3.19
B) Jserv in apps 11i is replaced by OC4J (mod_jserv is replaced by mod_oc4j)
C) Forms Version 6i in Apps 11i is replaced by Forms 10.1.2.0.2 in R12
D) Reports Version 6i in Apps 11i is replaced by Reports 10.1.2.0.2 in R12
E) JDBC version is changed from version 9 in apps 11i to version 10.2.0 in Apps R12
F) modplsql or mod_pls is removed from Apps R12
G) Java processes use JDK/JRE version 1.5.0 in R12 against JDK version 1.3.1 or 1.4.2 in Apps 11i
H) For various environment variable changes check below picture : -



I) New top INSTANCE_TOP added in Release 12 for configuration and log files: -

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Oracle Apps R12 File System Changes: -

new TOP (INSTANCE_TOP) in Application Tier.

If you are familiar with Oracle Apps 11i , you can easily understand picture on your right. This is file system for 11i with various TOP's , APPL_TOP, ORA_TOP, COMMON_TOP, DB_TOP and DATA_TOP. With Multiple Middle Tier configuration came shared APPL_TOP (only APPL_TOP used to be shared ) . After shared  APPL_TOP came shared Application Tier (All three TOP's on Application Tier, APPL_TOP, ORA_TOP and COMMON_TOP were shared across servers). With this came challenge of configuration files which are specific to a server mainly iAS & 806 configuration file. If you have configured Shared Application Tier (sharing ORA_TOP as well) in 11i then this problem was overcome by creating conf directory in COMMON_TOP.

In Oracle Apps R12, You can see new TOP called INSTANCE_TOP in Application Tier. This TOP will now hold any configuration files (specific to that server) , Certificates (If SSL is enabled SSL Certificates & any other certificates specific to that server) and related log files or pid files (for Apache or any other process). In diagram tops with <>ST can be shared across servers (Shared Tier) and INSTANCE_TOP will be specific to Server.


Next three pictures are taken from Ivo Dujmovic's presentation at Oracle Open World "Deep Dive: Oracle E-Business Suite Release 12 New Technology Stack". These Pictures are self explanatory & will help you in understanding Oracle Apps R12 File System.
This shows Oracle E-Business Suite Release 12 File System Layout


This shows Directory/File Structure for Instance TOP in R12


This Picture compares file system in 11i with File system in R12

 

 

 

 

Regards,

Sukhwinder Singh