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 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.