Help in perform using

Hallow
I wont to do this code for a lot of table that I have in program
I heard that I can use perform and using and changing but I dont now how
Plz help
I have adrtab_3082 ,3083,3084,3085,3086..
OPEN DATASET adress IN TEXT MODE
 ENCODING DEFAULT FOR OUTPUT.
IF sy-subrc = 0.
 no_file = ' '.
 LOOP AT adrtab_3082 INTO wa.
 TRANSFER wa TO adress.
 ENDLOOP.
 CLOSE DATASET adress.
ELSE.
 no_file = 'X'.
ENDIF.
IF sy-subrc = 0.
ENDIF.
regards

Hi,
The following program works fine... except for the open dataset... has few problems in my system... but the transfer of internal table is fine...
Use it...

REPORT ZNAN_TEST.
tables: lfa1, SSCRFIELDS.
data: flag type i value 0.
TABLES: MARA.
DATA: ADRESS TYPE STRING.
TYPES: BEGIN OF W_ITAB,
PSTAT LIKE MARA-PSTAT,
END OF W_ITAB.
DATA: ITAB TYPE TABLE OF W_ITAB.
start-of-selection.
SELECT PSTAT FROM MARA INTO TABLE ITAB.
perform data_transfer using itab[].
form data_transfer using itab TYPE TABLE .
DATA: W_ITAB TYPE ITAB.
adress = 'D:\DESKTOP\TES.TXT'.
OPEN DATASET adress IN LEGACY TEXT MODE FOR OUTPUT.
IF sy-subrc = 0.
LOOP AT itab INTO W_ITAB.
TRANSFER W_ITAB TO adress.
ENDLOOP.
CLOSE DATASET adress.
ELSE.
ENDIF.
endform.
Hope this solves your problem!
*Reward if helpful*
regards,
Naveenan.

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Need help in Performance tuning for function...

Hi all,
I am using the below algorithm for calculating the Luhn Alogorithm to calculate the 15th luhn digit for an IMEI (Phone Sim Card).
But the below function is taking about 6 min for 5 million records. I had 170 million records in a table want to calculate the luhn digit for all of them which might take up to 4-5 hours.Please help me performance tuning (better way or better logic for luhn calculation) to the below function.
A wikipedia link is provided for the luhn algorithm below
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 RETURN VARCHAR2
 AS
 Index_no NUMBER (2) := LENGTH (LuhnPrimitive);
 Multiplier NUMBER (1) := 2;
 Total_Sum NUMBER (4) := 0;
 Plus NUMBER (2);
 ReturnLuhn VARCHAR2 (25);
 BEGIN
 WHILE Index_no >= 1
 LOOP
 Plus := Multiplier * (TO_NUMBER (SUBSTR (LuhnPrimitive, Index_no, 1)));
 Multiplier := (3 - Multiplier);
 Total_Sum := Total_Sum + TO_NUMBER (TRUNC ( (Plus / 10))) + MOD (Plus, 10);
 Index_no := Index_no - 1;
 END LOOP;
 ReturnLuhn := LuhnPrimitive || CASE
 WHEN MOD (Total_Sum, 10) = 0 THEN '0'
 ELSE TO_CHAR (10 - MOD (Total_Sum, 10))
 END;
 RETURN ReturnLuhn;
 EXCEPTION
 WHEN OTHERS
 THEN
 RETURN (LuhnPrimitive);
 END AddLuhnToIMEI;
http://en.wikipedia.org/wiki/Luhn_algorithmAny sort of help is much appreciated....
Thanks
Rede

There is a not needed to_number function in it. TRUNC will already return a number.
Also the MOD function can be avoided at some steps. Since multiplying by 2 will never be higher then 18 you can speed up the calculation with this.
create or replace
FUNCTION AddLuhnToIMEI_fast (LuhnPrimitive VARCHAR2)
 RETURN VARCHAR2
 AS
 Index_no pls_Integer;
 Multiplier pls_Integer := 2;
 Total_Sum pls_Integer := 0;
 Plus pls_Integer;
 rest pls_integer;
 ReturnLuhn VARCHAR2 (25);
 BEGIN
 for Index_no in reverse 1..LENGTH (LuhnPrimitive) LOOP
 Plus := Multiplier * TO_NUMBER (SUBSTR (LuhnPrimitive, Index_no, 1));
 Multiplier := 3 - Multiplier;
 if Plus < 10 then
 Total_Sum := Total_Sum + Plus ;
 else
 Total_Sum := Total_Sum + Plus - 9;
 end if;
 END LOOP;
 rest := MOD (Total_Sum, 10);
 ReturnLuhn := LuhnPrimitive || CASE WHEN rest = 0 THEN '0' ELSE TO_CHAR (10 - rest) END;
 RETURN ReturnLuhn;
 END AddLuhnToIMEI_fast;
/My tests gave an improvement for about 40%.
The next step to try could be to use native complilation on this function. This can give an additional big boost.
Edited by: Sven W. on Mar 9, 2011 8:11 PM

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In which case we require to write perform using/changing

hi,
in which case we require to write perform using/changing .
and what is excatly we r doing with perform using.changing.
please somebody help me.
thanks
subhasis

This is an awfully basic question.
Simply press F1 on PERFORM.
And responders take note:
bapi
Rob

Improve data load performance using ABAP code

Hi all,
I want to improve my load performance using ABAP code, how to do this?. If i writing ABAP code in SE38 how i can call
in BW side? if give sample code to improve load performance it will be usefull. please guide me.

There are several points that can improve performance of your ABAP code:
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3. Use FOR ALL ENTRIES in your SELECT statement to retrieve the matching records at one shot.
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Click the link to download: http://dl.dropbox.com/u/19756227/Lightroom/Lightroom%20Activate%20Crop%20Tool%20Logfile.xl sx
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Capture #2 is meant to show you how long it takes to load an image activate and deactivate the Crop Tool (this is in the Develop module).
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- I see probably the majority of the time being spent creating and closing threads. That's probably where the real work happens. But I wonder if the threads could be optimized?
Anyway... that's just a bit of insight from a little tool used to monitor the process. I wonder if we could get Adobe Engineers (people with real access to the source code and debuggers) to check it out and see if they can find ways to optimize what Lightroom is doing?
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Perform using

hallow
i wont to now in which place it place better to use perform using and tables and which benefit i have from that ?
simle sample will help
regards

PERFORM - parameter_list
Syntax
... [TABLES itab1 itab2 ...]
[USING a1 a2 ...]
[CHANGING a1 a2 ...].
Extras:
1. ... TABLES itab1 itab2 ...
2. ... USING a1 a2 ...
3. ... CHANGING a1 a2 ...
Effect
These additions assign actual parameters to the formal parameters from the parameter interface for the subroutine subr. You can specify all data objects whose data type matches the typing of the corresponding formal parameter (see Check Typing) as actual parameters. Each formal parameter assumes all the properties of the actual parameter assigned to it when it is called.
Addition 1
... TABLES itab1 itab2 ...
Effect
If you specify the addition TABLES, each table parameter t1 t2 ... for the subroutine called that is defined with the addition TABLES to the FORM statement must be assigned an internal table itab as the actual parameter. The assignment of the actual parameters to the formal parameters takes place using their positions in the lists t1 t2 ... and itab1 itab2 ... .
You can only specify standard tables for itab. Transfer takes place by means of a reference. If a specified table itab has a header line, this is also transferred; otherwise, the header line in the corresponding table parameter t is blank when it is called.
Note
Use of table parameters in the interface for subroutines is obsolete but a large number of subroutines have not yet been converted to appropriately typed USING or CHANGING parameters, so that they must still be supplied with data by the TABLES addition to the PERFORM statement.
Example
Static call of the internal subroutine select_sflight transferring a table parameter.
PARAMETERS: p_carr TYPE sflight-carrid,
p_conn TYPE sflight-connid.
DATA sflight_tab TYPE STANDARD TABLE OF sflight.
PERFORM select_sflight TABLES sflight_tab
USING p_carr p_conn.
FORM select_sflight TABLES flight_tab LIKE sflight_tab
USING f_carr TYPE sflight-carrid
f_conn TYPE sflight-connid.
SELECT *
FROM sflight
INTO TABLE flight_tab
WHERE carrid = f_carr AND
connid = f_conn.
ENDFORM.
Addition 2
... USING a1 a2 ...
Addition 3
... CHANGING a1 a2 ...
Effect
If you specify the additions USING and CHANGING, an actual parameter a1 a2 ... of the appropriate type must be assigned to each of the formal parameters u1 u2 ... and c1 c2 ... defined with the same additions to the FORM statement. The actual parameters specified after USING and CHANGING form one shared list. They are assigned to the formal parameters after the position in the shared list. The type of parameter transfer is defined with the additions USING and CHANGING to the FORM statement. The addition USING must be before CHANGING. Otherwise, the assignment of the actual parameters to the additions USING and CHANGING is irrelevant to the PERFORM statement. It is also irrelevant whether only one or both of the additions is specified.
Notes
For the sake of program documentation, we advise that you specify the additions USING and CHANGING in the FORM statement according to the definition of the parameter interface.
In non-Unicode programs, you can address memory area outside an actual parameter if an actual parameter a1 a2 ... is assigned offset or length specifications. In non-Unicode programs, the length is set to the length of the current parameter if an offset is specified without a length. Both of these lead to warnings in the syntax check and to syntax errors in Unicode programs. The rules for the ASSIGN statement apply to the addressable memory area in non-Unicode programs as well.
Example
The following five PERFORM statements mean the same but only the fourth is recommended, since it is the only one that documents the interface of the subroutine called.
DATA: a1 TYPE string,
a2 TYPE string,
a3 TYPE string,
a4 TYPE string.
PERFORM test USING a1 a2 a3 a4.
PERFORM test CHANGING a1 a2 a3 a4.
PERFORM test USING a1 CHANGING a2 a3 a4.
PERFORM test USING a1 a2 CHANGING a3 a4.
PERFORM test USING a1 a2 a3 CHANGING a4.
FORM test USING p1 TYPE string
p2 TYPE string
CHANGING value(p3) TYPE string
value(p4) TYPE string.
ENDFORM.

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