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Why do we use CALL FUNCTION ..IN BACKGROUND TASK and CALL FUNCTION ...STARTING NEW TASK?
What is the difference?
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Answer Posted / sathish kumar
The IN BACKGROUND TASK statement allows you to execute remote enabled function modules in a background task asynchronously. Be careful thought as it might not quite work as it appears too i.e. If you debug the ABAP program logic it will step over the FM onto the next line of code, not waiting for this function module to finish it processing. But this doesn�t mean it has gone off to start the processing at this point as it has not!! It has simply created the background task ready for processing and will not actually be executed until a commit work is reached in the current logical unit of work.
So basically if you want it to go off and perform this background processing straight away you need to add a commit work after the call function� in background task command.
Just in case you are interested in the technical details when you make the call using the in background task addition SAP stores the FM name, destination and any parameters in tables ARFCSSTATE & ARFCSDATA for the current Logical unit of work. These entries can also been seen using tcode SE58. Please note this data is not available here after the task has finished processing.
Although this may seem strange at first it does allow you to perform other functionality first and only triggers the background task if all is well with that and it is committed to the database ok. Also the background tasks will be processed in the order they have been registered.
AS SEPARATE UNIT
The �as separate unit� addition is used if you are calling the same FM multiple times or FM�s within the same function group. It basically ensures each call is processed within its own context and is not affected by global data changes from other function calls.
DESTINATION
This simple allows you to specify a different RFC destination
Example ABAP code to Execute FM in background task
CALL FUNCTION 'Z_FMODULE' IN BACKGROUND TASK
EXPORTING
P_UNAME = sy-uname.
*IN BACKGROUND TASK additional options
CALL FUNCTION 'Z_FMODULE' IN BACKGROUND TASK
AS SEPARATE UNIT
DESTINATION 'NONE'
EXPORTING
P_UNAME = sy-uname.
break-point. "does not wait and continues with next line of ABAP code
Commit Work. "Background task is only triggered at this point.
"loop at itab into wa_itab.
"...
"endloop.
The STARTING NEW TASK statement allows you to call a function module but it will be executed in a separate processing task asynchronously so the ABAP program logic does not wait for this FM to finish its processing but continues with the next line of abap code. The clever thing about this statement is that once the FM has finished processing it will then execute the specified FORM within the original program to continue processing.
This small example is actually the basis for reports which auto-refresh themselves. i.e. the program calls a function module in a new task which then waits a few seconds (WAIT 10 seconds). Once it returns to the program and performs the return form it basically re-runs the whole report again. This especially creates an endless loop so report keeps updating itself until it is cancelled by the user.
Execute FM in update task within separate unit of work
CALL FUNCTION 'Z_FMODULE'
starting new task 'UPDATE'
destination 'NONE'
performing processing_done on end of task
EXPORTING
P_UNAME = sy-uname.
"program does not wait for FM to finish processing and continues with next line of ABAP code
break-point.
"...perform display_report.
FORM processing_done.
* In the mean time once processing of FM Z_FMODULE is complete this abap FORM is then executed.
WIthin here you can perform any processing you like, including re-displaying a report
"...perform display_report.
ENDFORM.
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D: Nothing, this is a syntax error. 7. You may change the following data object as shown below so that it equals 3.14. CONSTANTS: PI type P decimals 2 value '3.1'. PI = '3.14'. A: True B: False 8. The SAP service that ensures data integrity by handling locking is called: A: Update B: Dialog C: Enqueue/Dequeue D: Spool 9. Which of these sentences most accurately describes the GET VBAK LATE. event? A: This event is processed before the second time the GET VBAK event is processed. B: This event is processed after all occurrences of the GET VBAK event are completed. C: This event will only be processed after the user has selected a basic list row. D: This event is only processed if no records are selected from table VBAK. 10. Which of the following is not a true statement in regard to a hashed internal table type? A: Its key must always be UNIQUE. B: May only be accessed by its key. C: Response time for accessing a row depends on the number of entries in the table. D: Declared using internal table type HASHED TABLE. 11. TO include database-specific SQL statements within an ABAP program, code them between: A: NATIVE SQL_ENDNATIVE. B: DB SQL_ENDDB. C: SELECT_ENDSELECT. D: EXEC SQL_ENDEXEC. 12. To measure how long a block of code runs, use the ABAP statement: A: GET TIME. B: SET TIME FIELD. C: GET RUN TIME FIELD. D: SET CURSOR FIELD. 13. When a secondary list is being processed, the data of the basic list is available by default. A: True B: False 14. Given: DATA: BEGIN OF itab OCCURS 10, qty type I, END OF itab. DO 25 TIMES. itab-qty = sy-index. APPEND itab. ENDDO. LOOP AT itab WHERE qty > 10. WRITE: /1 itab-qty. ENDLOOP. This will result in: A: Output of only those itab rows with a qty field less than 10 B: Output of the first 10 itab rows with a qty field greater than 10 C: A syntax error D: None of the above 15. After a DESCRIBE TABLE statement SY-TFILL will contain A: The number of rows in the internal table. B: The current OCCURS value. C: Zero, if the table contains one or more rows. D: The length of the internal table row structure. 16. You may declare your own internal table type using the TYPES keyword. A: True B: False 17. After adding rows to an internal table with COLLECT, you should avoid adding more rows with APPEND. A: True B: False 18. Which of the following is not a component of control break processing when looping at an internal table? A: AT START OF B: AT FIRST C: AT LAST D: AT NEW 19. A dictionary table is made available for use within an ABAP program via the TABLES statement. A: True B: False 20. Which of the following would be best for hiding further selection criteria until a function is chosen? A: AT NEW SELECTION-SCREEN B: SELECTION-SCREEN AT LINE-SELECTION C: SUBMIT SELECTION-SCREEN D: CALL SELECTION-SCREEN 21. What must you code in the flow logic to prevent a module from being called unless a field contains a non-initial value (as determined by its data type)? A: ON INPUT B: CHAIN C: FIELD D: ON REQUEST 22. The AT USER-COMMAND event is triggered by functions defined in the ____. A: screen painter B: ABAP report C: menu painter status D: ABAP Dictionary 23. In regard to a function group, which of the following is NOT a true statement? A: Combines similar function modules. B: Shares global data with all its function modules. C: Exists within the ABAP workbench as an include program. D: Shares subroutines with all its function modules. 24. In regard to SET PF-STATUS, you can deactivate unwanted function codes by using ____. A: EXCLUDING B: IMMEDIATELY C: WITHOUT D: HIDE 25. In regard to data transported in PAI when the FIELD statement is used, which of the following is NOT a true statement? A: Fields in PBO are transported directly from PAI. B: Fields with identical names are transported to the ABAP side. C: Fields not defined in FIELD statements are transported first. 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B: Requires actual parameters. C: Recursive calls are allowed in ABAP. D: Can call a subroutine in another program. 53. What is the transaction code for the ABAP Editor? A: SE11 B: SE38 C: SE36 D: SE16 54. In regard to HIDE, which of the following is NOT a true statement? A: Saves the contents of variables in relation to a list line's row number. B: The hidden variables must be output on a list line. C: The HIDE area is retrieved when using the READ LINE statement. D: The HIDE area is retrieved when an interactive event is triggered. 55. Database locks are sufficient in a multi-user environment. A: True B: False 56. The complete technical definition of a table field is determined by the field's: A: Domain B: Field name C: Data type D: Data element 57. In regard to LEAVE, which of the following is NOT a true statement? A: May be used to return immediately to a calling program. B: May be used to stop the current loop pass and get the next. C: May be used to start a new transaction. D: May be used to go to the next screen. 58. The following code indicates: SELECT fld6 fld3 fld2 fld1 FROM tab1 INTO CORRESPONDING FIELDS OF TABLE itab WHERE fld3 = pfld3. A: The order of the fields in itab does not matter. B: Fill the header line of itab, but not the body. C: Table itab can only contain fields also in table tab1. D: None of the above. 59. The ABAP statement below indicates that the program should continue with the next line of code if the internal table itab: CHECK NOT itab[] IS INITIAL. A: Contains no rows B: Contains at least one row C: Has a header line D: Has an empty header line 60. What will be output by the following code? DATA: BEGIN OF itab OCCURS 0, fval type i, END OF itab. itab-fval = 1. APPEND itab. itab-fval = 2. APPEND itab. FREE itab. WRITE: /1 itab-fval. A: 2 B: 0 C: blank D: 1 61. To allow the user to enter a range of values on a selection screen, use the ABAP keyword: A: DATA. B: RANGES. C: PARAMETERS. D: SELECT-OPTIONS. 62. If an internal table is declared without a header line, what else must you declare to work with the table's rows? A: Another internal table with a header line. B: A work area with the same structure as the internal table. C: An internal table type using the TYPES statement. D: A PARAMETER. 63. Assuming an internal table contains 2000 entries, how many entries will it have after the following line of code is executed? DELETE itab FROM 1500 TO 1700. A: This is a syntax error. B: 1801 C: 1800 D: 1799 64. To remove lines from a database table, use ____. A: UPDATE B: MODIFY C: ERASE D: DELETE 65. All of the following may be performed using SET CURSOR except: A: Move the cursor to a specific field on a list. B: Move the cursor to a specific list line. C: Move the cursor to a specific pushbutton, activating that function. D: Move the cursor to a specific row and column on a list. 66. When is it optional to pass an actual parameter to a required formal parameter of a function module? A: The actual parameter is type C. B: The formal parameter contains a default value. C: The formal parameter's \"Reference\" attribute is turned on. D: It is never optional. 67. Coding two INITIALIZATION events will cause a syntax error. A: True B: False 68. Adding a COMMIT WORK statement between SELECT_ENDSELECT is a good method for improving performance. A: True B: False 69. To save information on a list line for use after the line is selected, use this keyword. A: APPEND B: EXPORT C: WRITE D: HIDE 70. To bypass automatic field input checks, include this in PAI. A: AT EXIT-COMMAND B: ON INPUT C: ON REQUEST D: LEAVE TO SCREEN 0. 71. Within a function module's source code, if the MESSAGE_RAISING statement is executed, all of the following system fields are filled automatically except: A: SY-MSGTY B: SY-MSGNO C: SY-MSGV1 D: SY-MSGWA 72. The following code indicates: REPORT ZLISTTST. START-OF-SELECTION. WRITE: text-001. FORMAT HOTSPOT ON. WRITE: text-002. FORMAT HOTSPOT OFF. AT LINE-SELECTION. WRITE / text-003. A: Text-002 may not be selected. B: The value of text-002 is stored in a special memory area. C: Text-002 may be clicked once to trigger the output of text-003. D: None of the above. 73. The ____ type of ABAP Dictionary view consists of one or more transparent tables and may be accessed by an ABAP program using Open SQL. A: Database view B: Projection view C: Help view D: Entity view 74. A concrete field is associated with a field-symbol via ABAP keyword A: MOVE B: WRITE C: ASSIGN D: VALUE 75. The output for the following code will be: report zabaprg. DATA: char_field type C. char_field = 'ABAP data'. WRITE char_field. A: ABAP data B: A C: Nothing, there is a syntax error D: None of the above 76. Page footers are coded in the event: A: TOP-OF-PAGE. B: END-OF-SELECTION. C: NEW-PAGE. D: END-OF-PAGE. 77. The event AT SELECTION-SCREEN OUTPUT. occurs before the selection screen is displayed and is the best event for assigning default values to selection criteria. A: True B: False 78. The TABLES statement declares a data object. A: True B: False 79. Assuming tab1-fld7 is not a key field, how can you prevent reading all the table rows? SELECT fld1 fld2 fld3 FROM tab1 INTO (fld4, fld5, fld6) WHERE fld7 = pfld7. WRITE: /1 fld4, fld5, fld6. ENDSELECT. A: Take fld7 out of the WHERE clause. B: Create an index in the ABAP Dictionary for tab1-fld7. C: Use INTO TABLE instead of just INTO. D: Take the WRITE statement out of the SELECT_ENDSELECT. 80. Which of the following is NOT a required attribute when creating an ABAP program? A: Application B: Title C: Status D: Type 81. When creating a transparent table in the ABAP Dictionary, which step automatically creates the table in the underlying database? A: Adding technical settings to the table B: Checking the table syntax C: Saving the table D: Activating the table 82. Within the ABAP program attributes, Type = 1 represents: A: INCLUDE program B: Online program C: Module pool D: Function group E: Subroutine pool 83. If this code results in an error, the remedy is: SELECT fld1 SUM( fld1 ) FROM tab1 INTO_ A: Remove the spaces from SUM( fld1 ). B: Move SUM( fld1 ) before fld1. C: Add GROUP BY f1. D: Change to SUM( DISTINCT f1 ). 84. Which keyword adds rows to an internal table while accumulating numeric values? A: INSERT B: APPEND C: COLLECT D: GROUP 85. Assuming itab has a header line, what will be output by the following code? READ TABLE itab INDEX 3 TRANSPORTING field1. WRITE: /1 itab-field1, itab-field2. A: The contents of the third row's itab-field1. B: The contents of the third row's itab-field1 and itab-field2. C: The contents of the third row's itab-field2. D: Nothing. 86. The following code indicates: SELECTION-SCREEN BEGIN OF BLOCK B1. PARAMETERS: myparam(10) type C, Myparam2(10) type N, SELECTION-SCREEN END OF BLOCK. A: Draw a box around myparam and myparam2 on the selection screen. B: Allow myparam and myparam2 to be ready for input during an error dialog. C: Do not display myparam and myparam2 on the selection screen. D: Display myparam and myparam2 only if both fields have default values. 87. Which statement will sort the data of an internal table with fields FRUIT, QTY, and PRICE so that it appears as follows? FRUIT QTY PRICE Apples 12 22.50 Apples 9 18.25 Oranges 15 17.35 Bananas 20 10.20 Bananas 15 6.89 Bananas 5 2.75 A: SORT itab DESCENDING BY QTY PRICE. B: SORT itab BY PRICE FRUIT. C: SORT itab. D: SORT itab BY PRICE DESCENDING. 88. Which keyword adds a line anywhere within an internal table? A: APPEND B: MODIFY C: ADD D: INSERT 89. To read a single line of an internal table, use the following: A: LOOP AT itab. _ ENDLOOP. B: READ itab. C: SELECT SINGLE * FROM itab. D: READ TABLE itab. 90. Which Open SQL statement should not be used with cluster databases? A: UPDATE B: MODIFY C: DELETE D: INSERT 91. To include a field on your screen that is not in the ABAP Dictionary, which include program should contain the data declaration for the field? A: PBO module include program B: TOP include program C: PAI module include program D: Subroutine include program 92. This flow logic statement is used to make multiple fields open for input after an error or warning message. A: GROUP B: FIELD-GROUP C: CHAIN D: LOOP AT SCREEN 93. Given: PERFORM subroutine USING var. The var field is known as what type of parameter? A: Formal B: Actual C: Static D: Value
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