Increase OACORE JAVA Heap Memory Size in r12

Recently we have faced performance issue in middle tier while running report. We know that Low JVM heave memory size in Oacore may cause low performance for WebLogic domain. To increase the oacore memory in R12.We must follow the below steps.

Check java default heap size in Oacore.

$ grep s_oacore_jvm_start_options $CONTEXT_FILE

<oacore_jvm_start_options oa_var="s_oacore_jvm_start_options">-XX:PermSize=128m -XX:MaxPermSize=384m -Xms1024m -Xmx1024m

Steps to increase oacore java heap memory.

Step 1. Login to the WebLogic Console using URL.


 Enter Username WebLogic and Password.
Increase JAVA Heap Memory Size in r12

Step 2. Click on lock and edit.

Click Edit

Step 3. Go to the Domain structure and expand environment the click on servers.

Expand Env Click On Servers 1

Step 4. After that click on each oacore_server.

Oacore Server1

Step 5. Click on Sub_Tab ‘Server Start’.

JAVA Heap Memory Size

Step 6. Go to Argument section.


Current Entry.

<oacore_jvm_start_options oa_var="s_oacore_jvm_start_options">-XX:PermSize=128m -XX:MaxPermSize=384m -Xms1024m -Xmx1024m

Change to .

<oacore_jvm_start_options oa_var="s_oacore_jvm_start_options">-XX:PermSize=128m -XX:MaxPermSize=384m -Xms2024m -Xmx2024m

Step 7. Click on ‘Save’ button to save the new configuration.

Step 8. Click on ‘Activate Changes’ to activate the changes in change centre.

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