Multiple OC4J's on Application Server

Question

Hi All,
What are the pros and cons of using multiple OC4Js on the same Application Server.? We have 5 j2ee applications and plan to deploy it on 5 different oc4js. I want to know if by doing this will the response time of the applications improve/reduce. Also what the about the load on the Application Server ?
Thanks
-Venkat
Message was edited by:
Venkat

Answer 1

Hi Venkat,
The only pro you will have by deploying 5 applications on 5 different OC4J instances is the administration of applications and maybe some maintenance. What do I mean by maintenance: rolling upgrades, bug fixes for the application etc, by having its own OC4J instance you can stop and restart the OC4J instance and not worry about the other applications i.e. no interruptions.
The cons:
- you need to make sure that eacj OC4J instance has enough memory i.e. you need to have enough physical memory on the system to support multiple OC4J's
- there will be no effect on OC4J performance but since the CPU utilization may go up it could have an adverse effect, this will depend on the actual system and I advise doing an impact test before going into production.
You do not mention the AS version but in 10.1.3 you can stop and start just the application and not have to bounce the OC4J instance so you might look into 10.1.3 (in that case the pro is one instance to manage and you do not have to worry about memory resources).
Hope this helps.
Deepak