does select single *.. / select * .. affect performance ? how?
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Answer Posted / kumar bgk
select single * ---> retrieves all the records in that
particular row defined by our selection citeria.
select * ---> retrieves all records from all the coloumns of
the table i.e., the entire table.
so the time consumed in retrieving all this information is
very high atleast in terms of programming and so it
significantly affects the performance.
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correct all performance problem without changing any functionality REPORT z_assignment_01. DATA: gt_user TYPE TABLE OF usr02 WITH HEADER LINE, gt_user_role TYPE TABLE OF agr_users WITH HEADER LINE, ********** DO NOT CHANGE THIS SECTION ********** g_begintime TYPE i, g_endtime TYPE i, g_tottime TYPE i. DATA: BEGIN OF gt_output OCCURS 0, bname LIKE usr02-bname, name_text LIKE adrp-name_text, agr_name LIKE agr_users-agr_name, text LIKE agr_texts-text, role_count TYPE i, END OF gt_output. TYPE-POOLS: slis. START-OF-SELECTION. GET RUN TIME FIELD g_begintime. ********** END NO CHANGE ********** SELECT * INTO TABLE gt_user FROM usr02 WHERE class > 'E'. SELECT * INTO TABLE gt_user_role FROM agr_users FOR ALL ENTRIES IN gt_user WHERE uname = gt_user-bname. PERFORM combine_tables. PERFORM get_addl_data. ********** DO NOT CHANGE THIS SECTION ********** GET RUN TIME FIELD g_endtime. g_tottime = ( g_endtime / 1000000 ) - ( g_begintime / 1000000 ). MESSAGE s398(00) WITH g_tottime. PERFORM output. ********** END NO CHANGE ********** *&---------------------------------------------------------------------* *& Form combine_tables *&---------------------------------------------------------------------* * Combine user and role tables *----------------------------------------------------------------------* FORM combine_tables. DATA: ls_usr21 TYPE usr21, ls_adrp TYPE adrp, ls_texts TYPE agr_texts. LOOP AT gt_user. * Get user name SELECT * INTO ls_usr21 FROM usr21 WHERE bname = gt_user-bname. SELECT * INTO ls_adrp FROM adrp WHERE persnumber = ls_usr21-persnumber. gt_output-name_text = ls_adrp-name_text. ENDSELECT. ENDSELECT. LOOP AT gt_user_role WHERE uname = gt_user-bname. * Only process roles that are currently active CHECK gt_user_role-from_dat <= sy-datum AND gt_user_role-to_dat >= sy-datum. * Get role text SELECT * INTO ls_texts FROM agr_texts WHERE agr_name = gt_output-agr_name AND spras = sy-langu AND line = 0. gt_output-text = ls_texts-text. ENDSELECT. gt_output-bname = gt_user-bname. gt_output-agr_name = gt_user_role-agr_name. APPEND gt_output. ENDLOOP. ENDLOOP. ENDFORM. " combine_tables *&---------------------------------------------------------------------* *& Form get_addl_data *&---------------------------------------------------------------------* * Get extra fields *----------------------------------------------------------------------* FORM get_addl_data. DATA: l_count TYPE i. * Count number of roles per user SORT gt_user_role BY uname. LOOP AT gt_user_role. ADD 1 TO l_count. AT END OF uname. LOOP AT gt_output WHERE bname = gt_user_role-uname. gt_output-role_count = l_count. MODIFY gt_output. CLEAR l_count. ENDLOOP. ENDAT. ENDLOOP. ENDFORM. " get_addl_data *&---------------------------------------------------------------------* *& Form output *&---------------------------------------------------------------------* * Output report *----------------------------------------------------------------------* FORM output. DATA: lt_fieldcat TYPE slis_t_fieldcat_alv, ls_fieldcat TYPE slis_fieldcat_alv, l_repid LIKE sy-repid, ls_layout TYPE slis_layout_alv, ls_variant TYPE disvariant. l_repid = sy-repid. CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE' EXPORTING i_program_name = l_repid i_internal_tabname = 'GT_OUTPUT' i_inclname = l_repid CHANGING ct_fieldcat = lt_fieldcat EXCEPTIONS inconsistent_interface = 1 program_error = 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. ls_fieldcat-seltext_l = 'Role Count'. ls_fieldcat-seltext_m = 'Role Count'. ls_fieldcat-seltext_s = 'Role Count'. ls_fieldcat-reptext_ddic = 'Role Count'. MODIFY lt_fieldcat FROM ls_fieldcat TRANSPORTING seltext_l seltext_m seltext_s reptext_ddic WHERE fieldname = 'ROLE_COUNT'. ls_layout-zebra = 'X'. ls_layout-colwidth_optimize = 'X'. CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY' EXPORTING is_layout = ls_layout it_fieldcat = lt_fieldcat i_save = 'A' is_variant = ls_variant TABLES t_outtab = gt_output EXCEPTIONS program_error = 1 OTHERS = 2. IF sy-subrc <> 0. MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4. ENDIF. ENDFORM. " output
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