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    Question :
    What is the difference between transactional rfc and regular rfc?
    Category SAP BASIS Interview Questions
    Rating (0.3) By 28 users
    Added on 7/10/2012
    Views 269
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    There are mainly 4 types of RFC communication in SAP. They are
    1.Synchronous RFC
    2.Asynchronous RFC
    3.Transactional RFC
    4.Queued RFC

    Synchronous RFC (sRFC) : In this type of RFC communication,
    the calling program waits until the requested processing
    step on the remote system has ended and then continues to
    work locally.
    In other words, both the systems involved must be available
    at the time the call is made.

    Asynchronous RFC (aRFC) : In this type of RFC communication,
    the calling program gives the request to the remote system
    and immediately continues to work locally. The requested
    processing step is executed on the remote system in isolation.
    If the remote system cannot be reached at the time of the
    call, the asynchronous calls of the RFC client are lost

    Transactional RFC (tRFC) : This type of RFC communication is
    similar to asynchronous RFC but by allocating a transaction
    id(TID) it guarantees that if a request is sent several
    times because of network problems it is processed only
    once. Unlike asynchronous RFC, in Transactional RFC the
    remote system does not have to be available at the moment
    the RFC client program start the call. The data is held in
    the source system until the target system is available.
    The report program RSARFCSE is called in the background at
    regular intervals and tries to place the unsuccessful
    requests, identified by their transaction id again.

    Queued RFC (qRFC) : This RFC communication is an extension
    to the transactional RFC. In this method, all the requests
    are queued up(inbound queue and outbound queue) and are
    processed in a sequence only if it is certain that all
    preceding calls are processed correctly. This method
    guarantees that all the requests are processed in the
    sequence in which they are received.
    This type of RFCs will be used in SCM (APO) systems for CIF
    queues etc where requests have to be processed in an order.

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