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tRFC


In This scenario the sender system used in TRFC to transfer information  to the receives server

this meaning that all the information that transfer to the too the recives server will executed one time only

you cannot define the sequence in which the function modules are executed,

nor the time of execution.

If an error occurs during the transfer, a batch job is scheduled, which sends the function module again after 15 minutes

qRFC with outbound queue

In This scenario the sender system used in outbound queue to serialize the data that is being sent his means that function modules

which depend on each other (such as update and then change)

are put into the outbound queue of the sender system,

and are guaranteed to be sent to the target system one after each other and one time only.

The received server has no knowledge of the outbound queue in the sender system meaning that in this scenario,

every SAP system can also communicate with a non-SAP system.

qRFC with inbound queue (and outbound queue)

In This scenario there is also outbound queue in the sender system and inbound queue in the recivied system

If a qRFC with inbound queue exists,

this always means that an outbound queue exists in the sender system,

This guarantees the sequence and efficiently controls the resources in the client system and received system

the inbound queue can process many data is the system resources

in the recived system at that time allow.

This prevents a server being blocked by a client A scenario with inbound queue in the server system is not possible,

since the outbound queue is needed in the sender system,

in order to guarantee the sequence and to prevent individual applications

from blocking all work processes in the sender system.

This blog is my summary of the SAP article

Sap Note:

http://help.sap.com/saphelp_nwpi711/helpdata/en/f0/02a63b9bb3e035e10000000a114084/content.htm

http://scn.sap.com/community/netweaver-administrator/blog/2012/11/05/qrfc-and-trfc-explanation

Best Regards

Naor Shalom

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