Best method to update database table for 3 to 4 million rows

Question

Hi All,
I have 3 to 4 million rows are there in my excel file and we have to load to Z-Table.
The intent is to load and keep 18 months of history in this table. 
so what should be best way for huge volume of data to Z-Table from excel file.
If is from the program, is that the best way use the FM 'GUI_DOWNLOAD' and down load those entries into the internal table and directly do as below
INSERT Z_TABLE from IT_DOWNLOAD.
I think for the huge amount of data it goes to dump.
please suggest me the best possible way or any psudo code  to insert those huge entries into that Z_TABLE.
Thanks in advance..

Answer 1

Hi,
You get the dump because of uploading that much records into itnernal table from excel file...
in this case, do the follwowing.
data : w_int type i,
         w_int1 type i value 1.
data itab type standard table of ALSMEX_TABLINE with header line.
do.
   refresh itab.
   w_int = w_int1..
   w_int1 = w_int + 25000.
   CALL FUNCTION 'ALSM_EXCEL_TO_INTERNAL_TABLE'
  EXPORTING
    FILENAME                      = <filename>
    I_BEGIN_COL                   = 1
    I_BEGIN_ROW                   = w_int
    I_END_COL                     = 10
    I_END_ROW                     = w_int1
  TABLES
    INTERN                        = itab
* EXCEPTIONS
*   INCONSISTENT_PARAMETERS       = 1
*   UPLOAD_OLE                    = 2
*   OTHERS                        = 3
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
if itab is not initial.
write logic to segregate the data from itab to the main internal table and then
insert records from the main internal table to database table.
else.
exit.
endif.
enddo.
Regards,
Siddarth