How to increase java heap size in EBS R12.2

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Why we need to increase the Java heap size:

Mainly we need to increase the  EBS Performance.

 Default oacore JVM heap size is 512 MB it's supports 50 to 100 users

 When our R12.2 instance reach more than 200 users we need to be increase the oacore size for better performance.

Oracle recommended to configure 2 GB JVM Heap Space for oacore.

This can roughly support 150 to 200 users depending on usage.

For higher user load additional oacore managed servers need to be
created.

Oracle recommend to have 1 managed server per 2 CPU.

Following steps how increase the oacore size. 
Step1: Login weblogic console



Step 2: Click à lock and edit



Step3: Choice the Domain tab and click à serves menu



Step4: Click àoacore_server1



Step 5: Click à server start



Step 6: Go to Argument tab


Then change the xms and xmx values default value is 512m

Default values

-XX:PermSize=128m -XX:MaxPermSize=384m -Xms512m -Xmx512m -

I changed the values in

-XX:PermSize=128m -XX:MaxPermSize=384m -Xms1024m -Xmx2048m –

What is mean by XX,Xms and Xmx?

XX is MaxPermSize
Xms is the minimum heap size
Xmx is the maximum heap size


Step 7: Click save and release the configuration tab.


Comments

  1. colin9 July 2020 at 02:59

    Hi, is there a way to change these setting without using the console?

    ReplyDelete
  2. Unknown19 January 2022 at 22:37

    Hey, thanks for the blog article.Really thank you! Great.
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    ReplyDelete

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