opmn in oracle apps R12

All about OPMN
=============

In R12 services are managed by OPMN(Oracle process manager and notification server).

OPMN COMPONENTS
==============
OPMN consists of two main components

1) Oracle Process Manager

2) Oracle Notification Server

1)Oracle Process Manager is responsible for below things.
=======================================
1) starting
2) stopping
3) restarting
4) monitoring the services it manages (this includes death detection and automatic restart of the process).


2) Oracle Notification Server

Oracle Notification Server is the transport mechanism for failure, recovery, startup, and other related notifications between components in AS.


Single configuration file(opmn.xml) is used OPMN to manage the services.
Config file location is given as $ORA_CONFIG_HOME/10.1.3/opmn/conf/opmn.xml

To see more in details
========================
http://docs.oracle.com/cd/B13597_05/core.904/b12057/common.htm#CACHJAGG

http://otndnld.oracle.co.jp/document/products/as10g/101300/B25221_03/core.1013/b15976/opmnctl.htm

wonderful document on opmn
==========================
http://isu.ifmo.ru/docs/IAS904/core.904/b12057/intro.htm#1015088

http://otndnld.oracle.co.jp/document/products/as10g/101300/B25221_03/core.1013/b15976/opmnctl.htm


OPMN SERVICES

Services managed by opmn are (grep process-type opmn.xml)

1) HTTP_Server
2) oacore
3) forms
4) oafm


Starting OPMN managed Services

Starting Complete OC4J container
=================================

 ./adopmnctl.sh startproc ias-component=OC4J

Starting individual process-type(s)

./adopmnctl.sh startproc ias-component=OC4J process-type=oafm              
./adopmnctl.sh startproc ias-component=OC4J process-type=forms
./adopmnctl.sh startproc ias-component=OC4J process-type=oacore



Starting HTTP Server (Apache)
      
./adopmnctl.sh startproc ias-component=HTTP_Server

Stoping OPMN managed Services

Stoping Complete OC4J container

./adopmnctl.sh stopproc ias-component=OC4J
    

Stoping individual process-type(s)
       
 ./adopmnctl.sh stopproc ias-component=OC4J process-type= oafm              
 ./adopmnctl.sh stopproc ias-component=OC4J process-type= forms
 ./adopmnctl.sh stopproc ias-component=OC4J process-type= oacore
    

Stoping HTTP Server (Apache)
./adopmnctl.sh stopproc ias-component=HTTP_Server

Benefits of OPMN

OPMN detects the death of the process which it manages and brings up in almost no time.
1) OS process is checked by OPMN for every 2 seconds.
2) forward ping: periodically OPMN pings the process for every 20 seconds and expects response
3) reverse ping: every 20 seconds managed process sends OPMN a ping notification.

Creating oc4j instances

=================

http://www.oracle.com/technology/tech/java/oc4j/1013/whitepapers/OC4J-FAQ-MGT-10131.pdf