How to upload 15 lakhs of record onto ztable with performance

Question

I have 15 to 20 lakhs of records in my internal table. I'm uploading it onto ztable in se11.
While doing so, it's taking lot of time.
I'm writing the following query:
MODIFY ZTABLE       FROM TABLE  ITAB(INTERNAL TABLE NAME).
Please let me know if there is any other alternative which gives better performance.
Moderator message - Moved to the correct forum
Edited by: Rob Burbank on Feb 2, 2010 11:59 AM

Answer 1

Hi Rob,
just trace a
MODIFY ZTABLE FROM TABLE ITAB
with ST05 and you will see what the DBI / DB does with this statement.
If i remember right you are on DB6. Given current releases it migth be possible
that a MERGE (which can handle arrays) will be used instead of UPDATE / INSERT on
a row by row basis.
On most platforms the modify from table is done row by row like this:
UPDATE dbtab_row.
IF sy-subrc NE 0.
   INSERT dbtab_row.
   IF sy-subrc NE 0.
      UPDATE dbtab_row.
   ENDIF.
ENDIF.
if the rows exist you will only see updates.
if the rows don't exist you will see updates (no record) followed by an insert (1 record).
In rare cases you might see update (no record), insert (no record, somebody else inserted this record after the first update), update (1 record).
Kind regards,
Hermann