Unified APPL_TOP : Changed Feature in Oracle Apps R12

In today’s post I’ll cover on Unified APPL_TOP in Oracle Applications R12 which is different from separate APPL_TOP in Oracle Applications 11i. Unified APPL_TOP make more sense if you are using multi node Oracle Applications R12.

In Oracle Applications 11i , in multi node installation each APPL_TOP have its different name and files in each APPL_TOP will depend on type of Node (i.e. Forms Node will have fmx or forms related files where as APPL_TOP belonging to CM only node will have rdf or files required to run CM node)

Starting from R12, it will use Unified APPL_TOP which means all files required for all middle tier services are included in all nodes of Multi Node installation (irrespective of services running on that node)

What are few changes because of Unified APPL_TOP ?

During Cloning of multi node Oracle Application install, only one copy (any one appl_top) of Application Node files need to copied to target instance.
During Cloning of Multi Node to Single Node you don’t have to merge APPL_TOP’s in R12 as required in 11i .
Services start/stop If you are using adstrtall.sh to start services on a node then it will start services which were configured to start during install on that node (You can still start a specific service even though it was not suppose to configure/start by calling startup script of that specific services).
To explain this better, lets assume you installed multi node R12 instance with Node 1 as Forms & Web Server where as Node 2 was installed with Concurrent Manager. Now on Node1 when you use adstrtall.sh script to start services as expected it will start Forms and Web services but unlike 11i, You can still start Concurrent Manager on Node1 by running adcmctl.sh
FND_NODES From R12 all nodes will have Y against all services (For multi Node) in FND_NODES table.

More on R12 with upgrade overview and other new features coming soon….

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About the Author Atul Kumar

Oracle ACE, Author, Speaker and Founder of K21 Technologies & K21 Academy : Specialising in Design, Implement, and Trainings.

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Leave a Comment:

Puspak says April 29, 2011

What is the difference between Shared APPL_TOP and Unified APPL_TOP in R12

Atul Kumar says April 29, 2011

@ Puspak,
In earlier releases of 11i when you install, files in APPL_TOP used to be depending on components you select (i.e. forms tier, webserver or concurrent manager).

In R12 when you install, all files are installed irrespective of what all components you select. This is called as unified appl_top .

Shared appl_top (also referred as shared application tier) is process of sharing appl_top (or application tier) across multiple nodes of apps.

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