Storage Method

Use

Before notification messages are delivered to a destination system, they are stored temporarily in a queue. Furthermore, notification messages that are to be bundled, that have failed to be delivered, or that have expired, are stored in queues.

Storage Methods

Method	Description
In Memory Only	With this option, the notification messages are kept in the memory of the PCo computer at the runtime of the agent instance and are not saved in addition. When an agent instance is stopped or the PCo computer is shut down, all notification messages in the queues are lost. Of all the storage methods, this option requires the fewest system resources.
Microsoft Message Queuing (MSMQ)	With this option, all the notification messages are kept in the memory of the PCo computer and saved using the Windows service Microsoft Message Queuing. Microsoft Message Queuing (MSMQ) is a Windows component developed by Microsoft. For more information about MSMQ, see the Microsoft documentation under http://msdn.microsoft.com/en-us/library/ms711472(v=VS.85).aspx. The notification messages are not lost when an agent instance is restarted. If you also use the option Make Queued Notification Messages Recoverable, the messages are not lost when the Windows operating system is restarted. Note If you use this option, notification messages must not be bigger than 4 MB. Note that the MSMQ framework also temporarily stores the notification messages in the computer memory. To allow quick access to the notification messages, PCo also keeps the messages in the memory.
File System	With this option, the notification messages are stored in the local file system of the PCo computer. The notification messages are not lost when an agent instance or the Windows operating system is restarted. Note SAP recommends this method for large notification messages (larger than 100 kB) that occur at a relatively low frequency (maximum one message every two seconds). If you do not select the Keep Messages in Memory option, this storage method places the least load on the main memory.

Method

Description

In Memory Only

With this option, the notification messages are kept in the memory of the PCo computer at the runtime of the agent instance and are not saved in addition.

When an agent instance is stopped or the PCo computer is shut down, all notification messages in the queues are lost.

Of all the storage methods, this option requires the fewest system resources.

Microsoft Message Queuing (MSMQ)

With this option, all the notification messages are kept in the memory of the PCo computer and saved using the Windows service Microsoft Message Queuing.

Microsoft Message Queuing (MSMQ) is a Windows component developed by Microsoft. For more information about MSMQ, see the Microsoft documentation under http://msdn.microsoft.com/en-us/library/ms711472(v=VS.85).aspx Information published on non-SAP site .

The notification messages are not lost when an agent instance is restarted. If you also use the option Make Queued Notification Messages Recoverable, the messages are not lost when the Windows operating system is restarted.

File System

With this option, the notification messages are stored in the local file system of the PCo computer. The notification messages are not lost when an agent instance or the Windows operating system is restarted.