Update the Z table taking Max time.

Question

Dear Friends,
I am updating a Z table for a sigle field value, I am doing it in loop and giving all the primary key fields in where condition, Its updating the records properly.
But The time is taking more if there are more records ( say 3000 + reacords ) , Now I am planning to update it in a single statement but the Sy-subrc is giving me 4 and the records were not updated in Z table.
pls let me know how to update the Z table in a single statement??
pls find the below code:
corent code:
    UPDATE zXX CLIENT SPECIFIED
                    SET zyy = it_finaldata-zyy
                 WHERE mandt = sy-mandt AND
                       matnr = it_finaldata-matnr AND
                       matkl = it_finaldata-matkl .
this is within a loop and working fine but taking max time more than 30 mins.
now I have moved all the data into anothere internal table ( the internal table is same like Z table )
I am using the below statement but its not working:
update zXX FROM table it_savedata.
Pls help me.
Thanks,
Sridhar

Answer 1

Hi
If u use update that line should exist in DB table otherwise the sy-subrc will be 4. You can use MODIFY statement . The advantage is that if a line exist it will modify that particular line otherwise it will create a new line in DB table.
MODIFY dtab FROM TABLE itab.
Regards
Sathar