OPMN is installed and configured with every Oracle Application Server installation type and is essential for running Oracle Application Server.It provides an integrated way to manage Oracle Application Server components.
How OPMN Works?The core of OPMN consists of the following three components:
o Oracle Notification Server
o Oracle Process Manager
o PM Modules
Oracle Notification Server
Oracle Notification Server (ONS) is the transport mechanism for failure, recovery, startup & other related notifications between components in Oracle Application Server.
It operates according to a publish-subscribe model: an Oracle Application Server component receives a notification of a certain type for each subscription to ONS.When such a
notification is published, ONS sends it to the appropriate subscribers.
Oracle Process Manager
Oracle Process Manager (PM) is the centralized process management mechanism in Oracle
Application Server and is used to manage Oracle Application Server processes. The PM is
responsible for starting, restarting, stopping, and monitoring every process it manages.
The OPMN server consists of 2 processes.
The first OPMN server process has only one purpose: to start the second OPMN server process when necessary.
The second OPMN server process handles all request traffic and does all the work.
If the second OPMN server process goes down as part of an opmnctl reload command or an unexpected crash it will be restarted by the first OPMN server process.
The Application Server Control Console also uses PM to manage processes.
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