*&---------------------------------------------------------------------*
*& Title: deleting tables ACCT*                                        *
*&---------------------------------------------------------------------*
REPORT ZZTTAMAC.
TABLES:
  ACCTHD, ACCTIT, ACCTCR.

CONSTANTS:
  PACKAGE_SIZE TYPE I VALUE 1000000. 
"核心关键点在这里，此处是调整一次性删除多少数据,这个值我的系统的极值点，
"如果你想使用，请自己去调整这个数值，系统原来的默认值是1000

DATA:
  ACCTHD_KEY_TAB LIKE ACCHD_KEY OCCURS PACKAGE_SIZE WITH HEADER LINE,
  ACCTIT_KEY_TAB LIKE ACCIT_KEY OCCURS PACKAGE_SIZE WITH HEADER LINE.
DATA:
  BEGIN OF ACCTCR_KEY_TAB OCCURS PACKAGE_SIZE.
        INCLUDE STRUCTURE ACCCR_KEY.
DATA:
    WAERS LIKE ACCTCR-WAERS,
  END OF ACCTCR_KEY_TAB,
  DEL_COUNT TYPE I.

PARAMETERS: P_TEST AS CHECKBOX DEFAULT 'X'.

* Delete table ACCTHD completely

CLEAR DEL_COUNT.
IF P_TEST IS INITIAL.
  DO.
* for runtime-estimations only: Just check how long 1000 deletes
* would take via taking off the asterix of the following line
* and commenting off the latter one:
* DO 1 TIMES.
*
    SELECT MANDT
           AWTYP
           AWREF
           AWORG
             FROM ACCTHD
             INTO  TABLE ACCTHD_KEY_TAB
      UP TO PACKAGE_SIZE ROWS.

    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.

    DELETE ACCTHD FROM TABLE ACCTHD_KEY_TAB.
    COMMIT WORK.
    DEL_COUNT = DEL_COUNT + SY-DBCNT.
    REFRESH ACCTHD_KEY_TAB.
    CLEAR ACCTHD_KEY_TAB.
  ENDDO.
  WRITE: / 'Table ACCTHD: ', DEL_COUNT, ' records deleted'.
ELSE.
  SELECT COUNT(*) FROM ACCTHD INTO DEL_COUNT.
  WRITE: / 'Table ACCTHD: ', DEL_COUNT, ' records read'.
ENDIF.

* DELETE TABLE ACCTIT COMPLETELY
CLEAR DEL_COUNT.

IF P_TEST IS INITIAL.
  DO.
* for runtime-estimations only: Just check how long 1000 deletes
* would take via taking off the asterix of the following line
* and commenting off the latter one:
* DO 1 TIMES.
*
    SELECT  MANDT
            AWTYP
            AWREF
            AWORG
            POSNR
           FROM ACCTIT
           INTO TABLE ACCTIT_KEY_TAB
      UP TO PACKAGE_SIZE ROWS.

    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.

    DELETE ACCTIT FROM TABLE ACCTIT_KEY_TAB.
    COMMIT WORK.
    DEL_COUNT = DEL_COUNT + SY-DBCNT.
    REFRESH ACCTIT_KEY_TAB.
    CLEAR ACCTIT_KEY_TAB.
  ENDDO.
  WRITE: / 'Table ACCTIT: ', DEL_COUNT, ' records deleted'.
ELSE.
  SELECT COUNT(*) FROM ACCTIT INTO DEL_COUNT.
  WRITE: / 'Table ACCTIT: ', DEL_COUNT, ' records read'.
ENDIF.

* Delete table ACCTCR completely
CLEAR DEL_COUNT.
IF P_TEST IS INITIAL.
  DO.
* for runtime-estimations only: Just check how long 1000 deletes
* would take via taking off the asterix of the following line
* and commenting off the latter one:
* DO 1 TIMES.
*
    SELECT MANDT
           AWTYP
           AWREF
           AWORG
           POSNR
           CURTP
           WAERS
             FROM ACCTCR
           INTO TABLE ACCTCR_KEY_TAB
              UP TO PACKAGE_SIZE ROWS.

    IF SY-SUBRC <> 0.
      EXIT.
    ENDIF.


    DELETE ACCTCR FROM TABLE ACCTCR_KEY_TAB.
    COMMIT WORK.
    DEL_COUNT = DEL_COUNT + SY-DBCNT.
    REFRESH ACCTCR_KEY_TAB.
    CLEAR ACCTCR_KEY_TAB.

  ENDDO.

  WRITE: / 'Table ACCTCR: ', DEL_COUNT, ' records deleted'.
ELSE.
  SELECT COUNT(*) FROM ACCTCR INTO DEL_COUNT.
  WRITE: / 'Table ACCTCR: ', DEL_COUNT, ' records read'.
ENDIF.