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what is synchronous and asyn... processing?

frnds is there and diff between syn.. and asynch.. updates.... and synchronous and asynchronous processing...

plzz clarify.....

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  • author's profile photo Former Member
    Former Member
    Posted on Sep 05, 2006 at 06:38 PM

    Hai Sanjay

    Go through the following Document




    What is BDC or batch input

    The Batch Input is a SAP technic that allows automating the input in transactions. It lies on a BDC (Batch Data Commands) scenario.

    BDC functions:

    E BDC_OPEN_GROUP : Opens a session group

    E BDC_CLOSE_GROUP : Closes a session

    E BDC_INSERT : Insert a BDC scenario in the session

    E The ABAP statement "CALL TRANSACTION" is also called to run directly a transaction from its BDC table.

    It runs the program RSBDCSUB in order to launch automatically the session. The session management is done through the transaction code SM35.

    The object itself is maintanable through the transaction SE24.

    BDC methods:





    Opens a session

    SUBRC (Return Code ? 0 OK)

    SESSIONNAME (Session to be created)


    Closes a session



    Resets the BDC Internal Table...

    None. Normally, for internal purposec


    Handles a new screen

    PROGNAME (Name of the program)

    DYNPRONR (Screen Number)


    Puts a value on the screen

    FIELDNAME (Name of the field)

    FIELDVALUE (Value to be passed)


    Constructor - Initializes NO_DATA

    NODATA (No data character). The constructor is called automatically when the object is created.


    Launches a session with RSBDCBTC



    Calls a transaction with the current BDC Data

    MODE (Display Mode)

    UPDATE (Update Mode)

    TCODE (Transaction to be called)


    Inserts the BDC scenario in the session

    TCODE (Transaction to be called)

    BDC techniques used in programs:

    1) Building a BDC table and calling a transaction,

    2) Building a session and a set of BDC scenarios and keeping the session available in SM35,

    3) Building a session and lauching the transaction right after closing the session.


    BDC using Call Transaction

    BDC using Call transaction involves calling an SAP transaction in back ground from within the ABAP

    program. The process involves building an Internal BDC table containing the screen information needed to

    execute the required transaction and then passing this to the Call transaction command (See code example).

    The full procedure for creating a BDC program is as follows:


    What is the difference between batch input and call transaction in BDC?

    Session method.

    1) synchronous processing.

    2) can tranfer large amount of data.

    3) processing is slower.

    4) error log is created

    5) data is not updated until session is processed.

    Call transaction.

    1) asynchronous processing

    2) can transfer small amount of data

    3) processing is faster.

    4) errors need to be handled explicitly

    5) data is updated automatically




    A: Batch-inputs can not be used to fill the "delivery due list" screen because it is not a dynpro. This is a standard SAP report. A SAP report (check with "System -> Status") may be called using SUBMIT sentence with the appropriate options . It is preferred to call a report than create a Batch-input program.




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  • Posted on Sep 05, 2006 at 06:40 PM

    Concept-wise a synchronous call waits for the response of the FM before proceeding for the next step in the logic. An asynchronous call however, doesnt wait for the response of the FM, as soon as the call is made it continues with the rest of the logic.

    So in a Sync

    Call FM1 --->>> waits until the FM is processed

    Do something


    Call FM1 --->>> Doesnt wait for FM and continues with logic

    Do something


    Sunil Achyut

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  • author's profile photo Former Member
    Former Member
    Posted on Sep 05, 2006 at 06:46 PM

    frnds thnks for ur reply...

    But then what is the purpose of saying in BDC synchronous processing and synchronous update as well as asynchronous

    processing and asynchronous update .

    So as i asked earlier is that processing and updating r same....

    plzz clarify.......

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