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  • We have moved to kindly check http://onlineAppsDBA.comin future
    Oracle Apps Load Balancer Setup for HTTP Server
    Wednesday, December 20, 2006
    Register for R12 upgrade

    I am going to cover most common load balancer setup in Oracle Apps 11i i.e. Setup Two or more Middle tier with Web Server & Form Server with Hardware Load balancer in front of middle tier . This type of setup is also called as "HTTP Layer Hardware Load balancing" in Oracle Applications.
    For overview & basics of Load balancing visit my previous post at

    Below are steps you need to follow to configure Multiple Middle Tier (Web & Forms Server ) with Hardware Load balancer in front.
    1. Setup a Load balancer such that it forwards requests to first middle tier only.
    2. Make sure sticky bit is set on load balancer for session persistence (Check Load balancer documentation), You can Network level switch as well to send requests to multiple middle tier
    3. Apply Prereq. patches (3175852, 3077386, 3209878)
    4. Edit following entry in XML or Context File directly ($APPL_TOP/admin/$CONTEXT_NAME.xml) or via Oracle Application Manager
    -- 4.1 "Web entry point Host" to the HTTP load-balancer machine name
    -- 4.2 "Web entry point Domain" to the HTTP load-balancer domain name
    -- 4.3 "Web entry protocol" to the HTTP load-balancer protocol e.g. "http" or "https"
    -- 4.4 "Active Web Port" to the value of the HTTP load-balancer's external port
    -- 4.5 "Login Page" to include "Web entry protocol"://"Web Host entry point"."Web domain entry point":"Active Web Port"
    -- 4.6 "disco_machine" to load balancer machine
    5. Run Autoconfig
    6. Start Services & check if you can login to applications via Load balancer
    7. Now clone this middle tier to another node (where you want to add another node)
    8. Make sure above parameter are pointing to load balancer in second node as well
    9. Change load balancer to point to second node only
    10. shutdown services on first node
    11. try accessing application from second node (you should be able to access application without issues)
    11.1 -- If forms are not opening properly , check "ICX Form Launcher .." Profile option should point to load balancer
    12. Now start application on both middle tier
    13. Point load balancer to both middle tier
    14. You should be able to access applications
    Things to Note :
    Above solution is for HTTP Layer load balancing & HTTP Server will forward Forms request to form server running on same node .
    Related Links
    Metalink Note : 217368.1 Advanced Configurations and Topologies for Enterprise Deployments of E-Business Suite 11i

    We have moved to

    kindly check in future

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    posted by Atul Kumar @ 2:49 PM  
    • At 9:22 AM, Blogger fhasweh said…

      very good post

      thank you

      fadi hasweh
      Oracle is not Magic, it just takes years of experience

    • At 4:37 PM, Blogger Navdeep Saini said…

      Hi Atul

      As promised i am checking your blog ;-)...
      Nice post.


    • At 1:55 PM, Blogger Sudhakar said…

      Hi Atul,

      Am going to implement the HTTP Layer Load Balancer for Oracle Apps HRMS. But am having a doubt about the prereq patch 3209878 which is a Oracle Configurator Patch. Please suggest whether we have to apply this patch even though we are not using the Oracle Configurator.

    • At 8:12 PM, Blogger Atul Kumar said…


      For any apps quesries/questions / doubts raise them in forum at

    • At 8:22 AM, Blogger vasu said…

      Hi atul,
      Is Networked load balancer will acts as a hardwared loadbalancer.

      I am having the 2 Apps tier nodes for production application and 2 for oracle 10g RAC, How can i achive this http load balancing

      with only two physical m/c for entire application services.



    • At 5:21 PM, Anonymous Anonymous said…

      Hi Atul,

      Quick question for you.

      In a load balanced environment with 2 middle tiers, what file can i edit so as to paste the server name of the middle tier I'm connected to into it ! i want to do this to help trouble shoot any apache issues i may have on either apps tier server and as the link will be the load balanced link I'd like to edit each configuration file to hardcode the server name into bottom of it

      e.g you are connected to server1



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