performance of a loop

[sudha_naik]

Hello All,

I have a nested loop which loops through two internal tables wsel and msel. Since there are thousands of records, this loop was taking time. It was found via ST12. Could anyone suggest way to improve this code so that it takes less time.

loop at msel where idxwt eq index.

loop at wsel where cuobj eq msel-cuobj

and mode eq ymodes-mode

and fwprd ne 0

and wtsta ne 'D'.

ssel-fsum = ssel-fsum + wsel-fwprd.

exit.

endloop.

endloop.

Thanks in advance

Sudha

[Former Member]

Hi,

Better to use the index for loops and try below option.

If possible better to delete entries in wsel table where fwprd <> 0 and wtsta <> D otther if this table entries are required in future, you can dump this data in temp table and delete that entries.

then use index as below.

sort wsel by cuobj mode.

loop at msel where idxwt eq index.

read table wsel with key cuobj = msel-cuobj

mode = ymodes-mode

binary search.

if sy-subrc = 0.

ssel-fsum = ssel-fsum + wsel-fwprd.

exit.

endif.

endloop.

If multiple entries in table wsel, then use below model

loop at msel where idxwt eq index.

read table wsel with key cuobj = msel-cuobj

mode = ymodes-mode

binary search.

if sy-subrc = 0.

loop at wsel from sy-tabix.

if cuobj <> msel-cuobj or

mode <> ymodes-mode.

exit.

endif.

ssel-fsum = ssel-fsum + wsel-fwprd.

exit.

endloop.

endif.

endloop.

[Former Member]

Hi,

In u r u can use read table inside first loop...endloop.

Whenever u use read table with key try to use binary search by sorting the internal table with that key.

sort wsel with cuobj mode fwprd wtsta.

loop at msel where idxwt eq index.

read table wsel with key cuobj eq msel-cuobj

and mode eq ymodes-mode

and fwprd ne 0

and wtsta ne 'D' binary search.

if sy-subrc eq 0.

ssel-fsum = ssel-fsum + wsel-fwprd.

endif.

endloop.

Use loop at where only when the number of records are less. While using loop at where each loop pass will search whole table for required condition so it will take large time.

Regards,

Sankar

[RaymondGiuseppi]

Declare wsel as :

DATA WSEL TYPE TABLE OF xxx WHITH NON-UNIQUE KEY CUOBJ MODE.

and

  LOOP AT msel WHERE idxwt EQ index.
    LOOP AT wsel WHERE cuobj EQ msel-cuobj
                 AND mode EQ ymodes-mode.
      CHECK fwprd NE 0.
      CHECK  wtsta NE 'D'.
      ssel-fsum = ssel-fsum + wsel-fwprd.
      EXIT.
    ENDLOOP.
  ENDLOOP.

<i>When you use the WHERE condition with a STANDARD or HASHED table, a full table scan is always required.

If you are working with a SORTED TABLE, the partial sequential processing can be optimized so that only the entries that actually satisfy the WHERE condition are processed. This optimization requires that the WHERE condition be specified in the form

WHERE k1 = v1 AND k2 = v2 AND ... AND kn = vn

where the components k1, ..., kn are in the same sequence as the beginning of the table key.</i>

Regards

[Former Member]

hi

loop at msel where idxwt eq index.

***loop at wsel where cuobj eq msel-cuobj

read the table

if sy-surrc eq 0

ssel-fsum = ssel-fsum + wsel-fwprd.

endif.

exit

endloop.

reward if usefull