OC4J Load Balancing on 10G R2

Greetings!
I am trying to set up OC4J with multiple JVMs on 10G R2 and did this by setting the Number of Processes parameter to 2 under Server Properties. We need sticky sessions in our app - my small tests so far seems to indicate this is working without me having to do anything.
The reason for doing multiple processes is that our app consumes a lot of memory and with the restriction on the max JVM heap size, we are trying to exploit the full capacity of high-end servers.
Here are my questions:
1. Is this really as easy as it seems ? :-) Am I missing something - settings etc.? I went through documentation below and it does not have anything specific on how to choose number of processes except saying it is "specific to a computer."
[http://download-west.oracle.com/docs/cd/B14099_11/core.1012/b14003/midtiermanage.htm]
2. Is session replication disabled by default? There is a link on the OC4J administration page for replication which is empty. This works for us as not all objects we put in session are serializable.
3. We have a configuration file that is read by a singleton. For multiple processes we want different values to be read by the singletons running on different processes. Is there a pattern for doing this? I am thinking of creating a lock file/index file to indicate if another process has already read the configuration. Anything better?
I am new to this. Will appreciate all comments/suggestions.
Regards,
Arnab.

Hello Arnab,
It looks like the Metalink Note 175593.1
"Configuring Multiple OC4J Instances as a High Availability Cluster"
would be of a good help to answer your questions.
Sincerely,
Steff

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FRM-92101: Load Balancing Forms 10g with Web Cache

Hi,
IÂ´m having some problems with Oracle Forms and Webcache 10g and I was wondering if you
could help.
Machines: (Pentium IV 2.6 GHz; 2GB RAM; 80GB HD)
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([email protected])

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I appended the Cookie lines you mentioned in httpd.conf located in $ORACLE_HOME/Apache/Apache/conf in both machines B and C.
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dcmctl stop
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HTH,
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step by step to make the configuration of the following components:
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([email protected])

Did you ever Get this to work?
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A: SERVER
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Regards,
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Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
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For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
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2. Modify the mod_oc4j.conf as follows:
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Okay, how about if you have multiple web application that are sharing the session.
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-steve-

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Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
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For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
To implement the solution, please execute the following steps:
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A question about oc4j load balancing/ failover behaviour

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
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<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
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Thanks in advance
- Al

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
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<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
and
<frontend host="<host>" port="80" />
- I entered <cluster-config/> and <session-tracking/> in each oc4j instance's orion-web.xml, and <distributable/> in their web.xml files.
- I started the loadbalancer(java -jar loadbalancer.jar -debug) and the oc4j instances.
Everything works fine up to a point. They are both added to the cluster and the debug messages show that requests are being routed to oc4j1 and cluster session value update messages are sent by oc4j1 and received by oc4j2. When I shut down oc4j1 requests are routed to oc4j2 and session information is maintained.
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Oracle Metrics Load Balancing

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try this,
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Load Balancing with 10g RAC

Deploy Forms and Reports with Load Balancing

I am trying to determine what we need to install here. I have read OracleAS, Web Cache, Application Server, and
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We are currently run 9iAS with Forms and Reports 6i only.
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Forms and Reports 10g. I need to setup an OracleAS 10g
Forms and Reports application server with the ability to
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I am a DBA and have not done an iAS or AS installation
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install to just run 10g Forms and Reports and setup
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Load balancing 10g forms - Connection from new browser window not supported

Load balancing 10g forms - Connection from new browser window not supported
We're experimenting with using webcache to load balance between multiple applications servers running OC4J forms processes.
We currently have one machine with infrastructure and mid-tier (BI & Forms) installed, which is being used for the webcache functionality, this is load balancing between 2 other servers each of which just have the mid-tier (BI & Forms) installation
In order to get this to work, I had to follow the instructions in the Forms deployment guide : http://download-uk.oracle.com/docs/cd/B14099_11/web.1012/b14032/tuning.htm#sthref707
The main gist of this is that you need to set the following in the orion-web.xml file in order that the sessions are maintained:
<session-tracking
cookies="enabled">
</session-tracking>
This all works fine in most cases.
The problem I am having is if I do one of the following on the client machine:
1) From IE6 / IE7 run a copy of a forms application. Then open a new window using the "New Window" menu option, and attempt to run another forms application.
2) In IE7 or Firefox 2.0 open a copy of the forms application, and then open a new tab and try and open another forms application.
If I try either of these I get a FRM-92101 error, and the following is displayed in the java console:
oracle.forms.net.ConnectionException: Connection from new browser window not supported
From trawling various forums (including metalink and otn) it looks like a problem with the way coockies are handled.
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The problem is that I need this enabled in order for the load balancing to work.
Does anyone know of any other workarounds or patches that might help resolve this?
We're using Application server 10.1.2.0.2 running on windows 2003 servers.

You were right. Carriage returns were stopping it from working (the document is laid out over separate lines, so I assumed it would make no difference...).
I've now managed to get it so the forms at least run, but they are all being run in the forms OC4J instance on the same machine as the OHS.
Has anyone actually managed to get this to work, or am I doing something wrong?
I did wonder if using an OHS instance on a machine with no forms installation would make any difference?
I had raised a support call via metalink on this subject, but they eventually came to the conclusion that the only way to do this is with a hardware load balancer (Despite several documents suggesting that webcache is the way to go (including the forms deployment manual)).
I'm at the point now of giving up and writing some custom scripts to do the job instead...

Cluster (Load balancing) implementation in obiee 10g

Hi All,
We need to implement clustering (Active-Active for Load balancing) in our project. We use both analytics and bi publisher. We also need to deploy analytics/bipublisher in to weblogic server for SSO purpose.
Now we have two machines.
As of now We did the installation of obiee10g (while installing we selected "Complete" button) in both machines. Could any body tell us how to implement clustering w.r.t to weblogic.
To proceed futher we need to know..
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Hi User,
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http://www.iwarelogic.com/2010/01/supply-chain-management-w-r-t-oracle-applications-312/
http://docs.oracle.com/cd/E23943_01/upgrade.1111/e10126/wls_oc4j_comparisons.htm
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My project tool details.
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2. OBIEE 10.1.3.4.1
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If you have any concerns please post me.
Award points it is useful.
Thanks,
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Edited by: satya R on Apr 1, 2012 9:03 PM

OC4J Load Balancing on 10G R2

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