How to increase java
heap size in EBS R12.2
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 à oacore_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.