Improve data load performance using ABAP code

Question

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.

Answer 1

There are several points that can improve performance of your ABAP code:
1. Avoid using SELECT...ENDSELECT... construct and use SELECT ... INTO TABLE.
2. Use WHERE clause in your SELECT statement to restrict the volume of data retrieved.
3. Use FOR ALL ENTRIES in your SELECT statement to retrieve the matching records at one shot.
4.Avoid using nested SELECT and SELECT statements within LOOPs.
5. Avoid using INTO CORRESPONDING FIELDS OF. Instead use INTO TABLE.
6. Avoid using SELECT * and select only the required fields from the table.
7. Avoid Executing a SELECT multiple times in the program.
8. Avoid nested loops when working with large internal tables.
9.Whenever using READ TABLE use BINARY SEARCH addition to speed up the search.
10. Use FIELD-SYMBOLS instead of a work area when there are more than 200 entries in an internal table where some fields are being manipulated.
11. Use MOVE with individual variable/field moves instead of MOVE-CORRESPONDING.
12. Use CASE instead of IF/ENDIF whenever possible.
13. Runtime transaction code se30 can be used to measure the application performance.
14. Transaction code st05 can be used to analyse the SQL trace and measure the performance of the select statements of the program.
15. Start routines can be used when transformation is needed in the data package level. Field/individual routines can be used for a simple formula or calculation. End routines are used when you wish to populate data not present in the source but present in the target.
16. Always use a WHERE clause for DELETE statement. To delete records for multiple values, use SELECT-OPTIONS.
17. Always use 'IS INITIAL' instead of equal to '' because null for a character is '' but '0' for an integer.
Hope it helps.