Questions on the Hardware requirement mention in the 12c installation guide

Question

Hello experts,
I have a confusion on the Hardware requirements mentioned in the 12c installation guide where they mentioned as below.
RAM with ADP1, JVMD2 8 GB 12 GB 20 GB
1 ADP Manager is Application Dependency and Performance
2 JVMD is JVM Diagnostics
Question 1: what does this RAM with ADP or JVMD mean. is it just the additional RAM space required in the server or does is that special requirement ??
Oracle WebLogic Server JVM Heap 1.7 GB 4 GB 8 GB
Size
Question 2: What is this JVM Heap size ? how do we configure this in the server ??
Thanks in Advance for your Help.

Answer 1

Hi,
#1: It means if you also want to install ADP and JVMD, the total RAM required is a small (e.g. < 1000 targets), medium (e.g. > 1000 targets and < 10000 targets), large EM deployment (e.g. > 10000 targets) is 8 GB, 12 GB, 20 GB, respectively. That is the memory requirement for an OMS host.
#2: The heap size for the OMS java process. You can adjust the heap size by changing the -Xmx<heapsize> (see an example below) in the following file:
<middleware_home>/gc_inst/user_projects/domains/GCDomain/bin/startEMServer.sh
An example of OMS heap size setting of 2048 MB:
if [ "${SERVER_NAME}" != "EMGC_ADMINSERVER" ] ; then
USER_MEM_ARGS="-Xms256m -Xmx1740m -XX:MaxPermSize=768M -XX:-DoEscapeAnalysis -XX:+UseCodeCacheFlushing"
if [ "${JAVA_VENDOR}" = "Sun" ] ; then
if [ "${PRODUCTION_MODE}" = "" ] ; then
USER_MEM_ARGS="-Xms256m -Xmx2048m -XX:MaxPermSize=768M -XX:-DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSClassUnloadingEnabled -XX:CompileThreshold=8000 -XX:PermSize=128m"
Regards,
- Loc