Performance Issue in Large volume of data in report

Question

Hi,
I have a report that will process large amount of data, but it takes too long to process the data into final ALV table, currently im using this logic.
Select ....
Select for all entries...
Loop at table into workarea...
read table2 where key = workarea-key binary search.
modify table.
read table2 where key = workarea-key binary search.
modify table.
endloop.
Currently i select all data that i need (only fields necessary) create a big loop and read other table to insert it to the fields in the final table
Edited by: Alvin Rosales on Apr 8, 2009 9:49 AM

Answer 1

Hi ,
You can use field symbols instead of work area.
If you use field symbols there is no need of modify statement.
Here are two equivalent code:
1) using work areas :
types: begin of  lty_example,
col1 type char1,
col2 type char1,
col3 type char1,
end of lty-example.
data:lt_example type standard table of lty_example,
       lwa_example type lty_example.
field-symbols : <lfs_example> type lty_example.
suppose if you have the following information in your internal table
col1 col2 col3
1      1    1
1      2    2
2      3    4
Now you may use the modify statement using work areas
loop at lt_example into lwa_example.
lwa_example-col2 = '9'.
modify lt_example index sy-tabix from lwa_example transporting col2.
endloop.
or better using field-symbols:
loop at lt_example assigning <lfs_example>
<lfs_example>-col2 = '9'.
*here there is no need of modify statement.
endloop.
The code using field-symbols is about 10 times faster tahn using work areas and modify statement.