问题描述：

绝大多数用户能正常访问系统，但有一部分用户反馈打开Oracle Apps R12页面后，页面为空白页或者报PoolException。

或者报：Unable to generate forwarding URL. Exception: oracle.apps.fnd.common.AppsException: oracle.apps.fnd.common.PoolException: Exception creating new Poolable object.

问题分析：

在线用户760，4个OACore Process，应用服务器为双节点，一个节点支撑400多个Form，两个节点800个Form，应用服务器Swap内存消耗超过50%。

OC4JGroup:default_group          | OC4J:forms         | 232653~ | Alive   
OC4JGroup:default_group          | OC4J:forms         | 222823~ | Alive   
OC4JGroup:default_group          | OC4J:forms         | 501352~ | Alive   
OC4JGroup:default_group          | OC4J:forms         | 313263~ | Alive

1、应用服务器内存的调整：控数据库服务器内存(96GB)使用内存不高(物理内存约60%左右)。从数据库服务器调拨12G内存到应用服务器。应用服务器内存从30G提升为42G；

数据库服务器原来为94G，调整后为84G；

2、OACore的调整：OACore从一个节点4个（双节点8个），调整到一个节点8个（双节点16个）；

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sometimes you need to increase the oacore process counts. There is a detailed calculation to determine the needed oacore process for an instance, but in general; it s based on the user count..Basically user count / 100 will give you the needed oacore process count.. Note that, the memory size that you will assign to these processes are also important for determining the right process counts.

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How to change the number of OACORE JVMs in R12 with minimal disruption（source）
Goal: To change the number of OACORE JVMs from 1 to 5 in R12 with almost no outage.

Highlights:

- No need to run autoconfig
- Minimal outage required (probaly < 1 min)
- Preserve the changes even if autoconfig is run at a later time.

Steps
1. On the Apache node, cd $ORA_CONFIG_HOME/10.1.3/opmn/conf/opmn.xml
2. Backup the opmn.xml
3. Edit the following section of opmn.xml

< /process-type>
< process-type id="oacore" module-id="OC4J" status="enabled" working-dir="$ORACLE_HOME/j2ee/home">
< module-data>
< category id="start-parameters">
< data id="java-options" value="-server -verbose:gc –Xmx1024M –Xms1024M -XX:MaxPermSize=160M -XX:NewRatio=2 -XX:+PrintGCTimeStamps -XX:+UseTLAB -XX:+UseParallelGC -XX:ParallelGCThreads=2 -Dcom.sun.management.jmxremote -Djava.security.policy=$ORACLE_HOME/j2ee/oacore/config/java2.policy -Djava.awt.headless=true -Dhttp.webdir.enable=false -Doracle.security.jazn.config=/apps/local/CEPRD/inst/apps/CEPRD_c7-ipnt-53/ora/10.1.3/j2ee/oacore/config/jazn.xml">
< data id="java-bin" value="/apps/local/CEPRD/inst/apps/CEPRD_c7-ipnt-53/admin/scripts/java.sh">
< data id="oc4j-options" value="-out /apps/local/CEPRD/inst/apps/CEPRD_c7-ipnt-53/logs/ora/10.1.3/opmn/oacorestd.out -err /apps/local/CEPRD/inst/apps/CEPRD_c7-ipnt-53/logs/ora/10.1.3/opmn/oacorestd.err">
< /category>
< category id="stop-parameters">
< data id="java-options" value="-server -verbose:gc -Xmx512M -Xms128M -XX:MaxPermSize=160M -XX:NewRatio=2 -XX:+PrintGCTimeStamps -XX:+UseTLAB -XX:+UseParallelGC -XX:ParallelGCThreads=2 -Djava.security.policy=$ORACLE_HOME/j2ee/oacore/config/java2.policy -Djava.awt.headless=true -Dhttp.webdir.enable=false">
< /category>
< category id="security-parameters">
< data id="wallet-file" value="file:/apps/local/CEPRD/inst/apps/CEPRD_c7-ipnt-53/certs/Apache">
< /category>
< /module-data>
< start retry="2" timeout="600">
< stop timeout="120">
< restart retry="2" timeout="720">
< port id="default-web-site" protocol="ajp" range="21585-21589">
< port id="rmi" range="20085-20089">
< port id="jms" range="23085-23089">
< process-set id="default_group" numprocs="1">
< /process-type>

In the above block, change the tag from < process-set id="default_group" numprocs="1">to < process-set id="default_group" numprocs="5">.

4. In the context file, change the following block from < oacore_nprocs oa_var="s_oacore_nprocs">1 to < oacore_nprocs oa_var="s_oacore_nprocs">5

5. Do NOT run autoconfig
6. adopmnctl.sh reload
7. Validate that 5 JVMs have been indeed started by adopmnctl.sh status

Risks and things to watch out for:

1. Make sure the port range for rmi and jms is 5.
2. Make sure those ports are not in use by using netstat command.
3. If the port range is not specifying 5 ports, assign 5 ports as per the port pool value.

For eg, if your port pool is 17, then rmi range will be 20085 - 20089 and jms range will be 23085- 23089.

4. Make similar change in context file so that your changes are not
5. You have a choice of customizing your template rather than directly changing your xml file as well.

参考：

EBS R12--change oacore jvm count

How to increase oacore processes in R12

How to change the number of OACORE JVMs in R12 with minimal disruption