Depending on the size of your environment, you might need to increase the heap size for your Web application server to optimize performance. While the default can be used in a test environment (single server type configuration), the heap size must be increased for use in a production environment (multiple servers).
Choose a method:
To increase the heap size for the Windows service, update the Windows registry for Windows services using regedit. For HKEY_LOCAL_MACHINE\SOFTWARE\Hyperion Solutions\Product Component\ServiceName, update the JVMOptionX (where X is 1, 2, ...) whose value starts with -Xmx.
Edit a product's custom start script to specify the desired heap sizes. For example, for Shared Services, open EPM_ORACLE_INSTANCE/bin/deploymentscripts/setCustomParamsFoundationServices.bat|.sh, and modify the –Xms128m –Xmx1024m entry.
Restart the Windows service or rerun the script for the product after making changes.