Hello experts read table statement is not working properly

Question

Hello Experts.
my code is like this.
sort it_matnr by matnr.
loop at itab_result.
read table it_matnr with key matnr = itab_result-matnr  binary search.
endloop.
there are nearly 2000 records in it_matnr . The records which satisfy the above condition is there here in this internal table. But it is unable to read the record which matches the condition. One thing is that , there are more than one record with the same material. ie mblnr is different but material is the same. In it_matnr table i have only 1 field ie matnr ,so i need to compare only with the matnr.I also tried by sorting it_result by matnr but of no use. Then finally I used loop at where matnr = it_result-matnr , it is working fine. But due to performance reasons we should not use this. so please tell me what to do and correct the code.

Answer 1

1. Make sure that the table IT_MATNR is not getting updated inside the loop. Because it will then destroy the sorting.
2. Secondly, if there are multiple records in IT_MATNR for the same material then it will search for the first record encountered in binary algo. So it is advisable that you may provide further filter criteria if possible. check if ITAB_RESULT & IT_MATNR have any other matching field that can be put in filter criteria.
3.Thirdly, check if your requirement can be achieved by STABLE SORT.
<b>SORT <itab> ... STABLE BY <f1>[ASCENDING/DESCENDING].</b>
It will allows you to perform a stable sort, that is, the relative sequence of lines that are unchanged by the sort is not changed. If you do not use the STABLE option, the sort sequence is not preserved. If you sort a table several times by the same key, the sequence of the table entries will change in each sort. However, a stable sort takes longer than an unstable sort.
4. Lastly, you can use parallel cursor technique of multiple loops which is given below:
LOOP AT itab_result.
  READ TABLE it_matnr
    WITH KEY matnr = itab_result-matnr
    BINARY SEARCH.
Process record
  LOOP AT it_matnr FROM sy-tabix.
    IF it_matnr <> itab_result-matnr.
      EXIT.
    ENDIF.
Process record based on yuor condition
  ENDLOOP.
ENDLOOP.