wat is RFC?wat r the RFC types?

Answer Posted / raktim

A remote function call is a call to a function module
running in a system different from the caller's. The remote
function can also be called from within the same system (as
a remote call), but usually caller and called will be in
different systems.

SAP ABAP RFCs are of 3 types:
1. Synchronous RFC
2. Transactional RFCs
3. Queued RFCs.

1. Synchronous RFC
In Synchronous RFCs both the Systems must be available at
the time of the call. These RFCs are based on Synchronous
communication.

2. Transactional RFCs
Here the called system need not be available at the time of
the call. A unique transaction ID is generated and the
called program is stored in the system along with the data.
If the receiving system is not available for a long time
then the call is scheduled to run in a batch.

3. Queued RFCs.

To guarantee that multiple LUWs are processed in the order
specified by the application, tRFC can be serialized using
queues (inbound and outbound queues). This type of RFC is
called queued RFC (qRFC).

qRFC is therefore an extension of tRFC. It transfers an LUW
(transaction) only if it has no predecessors (in reference
to the sequence defined in different application programs)
in the participating queues.

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