How to increase the number of JVM and required memory in 11i/R12

How to increase the number of  oacore process type(JVM) and required memory in R12

Name of the file: opmn.xml
Location in R12:$INST_TOP/apps/SID_HOSTNAME/ora/10.1.3/opmn/conf/opmn.xml

1. To increase number of  oacore process type (JVM) in R12.

Go to $INST_TOP/apps/SID_HOSTNAME/ora/10.1.3/opmn/conf/

Take a backup of opmn.xml file before editing,

A)Open the opmn.xml file and go to line no-128 and increase

numprocs=4

2. How to increase the JVM Memory in R12:
   
   

To increase the memory for JVM.

In the same file go to line no-114

FROM:-server -verbose:gc -Xmx512M -Xms128M -XX:MaxPermSize=160M - XX:NewRatio=2
-XX:+PrintGCTimeStamps

Example :

to increase set :
Xms128M to Xms512M = Memory allocated upfront to the JVM
Xmx512M to Xmx1024M = Maximum Memory allocated to the JVM

TO:
server -verbose:gc –Xmx1024M -Xms256M -XX:MaxPermSize=256M -XX:NewRatio=2
-XX:+PrintGC

How to increase the number of JVMs in 11i

You can edit the xml file and make the change as follows to increase (earlier 1 - now 2)the oacore JVMs and then run autoconfig :

<oacore_nprocs oa_var="s_oacore_nprocs">2</oacore_nprocs>

Set the number of jvm as required and run autoconfig .

This will affect the jserv.conf (following line)

ApJServGroup OACoreGroup 1 1 /u03/oracle/prodora/iAS/Apache/Jserv/etc/jserv.properties


Alternatively : Manually increase the number of JVMs in $IAS_ORACLE_HOME/Apache/Jserv/etc/jserv.conf
and bounce Apache

How to increase the JVM Memory in 11i:

To increase the memory for oacore JVM, edit the file $IAS_ORACLE_HOME/Apache/Jserv/etc/jserv.properties

wrapper.bin.parameters=-verbose:gc -Xmx512M -Xms128M -XX:MaxPermSize=128M -XX:NewRatio=2 -XX:+PrintGCTimeStamps -XX:+UseTLAB
to
wrapper.bin.parameters=-verbose:gc -Xmx1024M -Xms512M -XX:MaxPermSize=128M -XX:NewRatio=2 -XX:+PrintGCTimeStamps -XX:+UseTLAB


- We normally allocate 2 or 4 jvms - We do not allocate 10 / 15


Example - refer to : oc4j_socket_recvfull-timed-out-Connect-failed