Doubt in IMS checkpoint logic..

salar · New User Joined: 20 Sep 2005 Posts: 4

I have the following code with me. PT3A,PT3E are tables.

2000-MAIN-PROCESS
PERFORM 2100-UPDATE-PT3A THRU 2100-EXIT
Updates table with input from a parmfile row-by-row.
PERFORM 2200-UPDATE-PT3B THRU 2200-EXIT
PERFORM 2300-UPDATE-PT3C THRU 2300-EXIT
PERFORM 2400-UPDATE-PT3D THRU 2400-EXIT
PERFORM 2500-UPDATE-PT3E THRU 2500-EXIT
PERFORM 8000-READ-INPUT-FILE THRU 8000-EXIT
PERFORM 9710-ISSUE-XPOINT THRU 9710-IX-EXIT

9710-ISSUE-XPOINT.

MOVE 'CHECKPOINT ' TO XW05-FUNC-NAME
CALL 'CBLTINT' USING WC-IMS-CHKPOINT
XA07
7-BGNNG-XPOINT-BOOKEND
7-ENDING-XPOINT-BOOKEND
7-BXB-NCKNQ.
MOVE XA07 TO XW05-XDBPCB.

2100-UPDATE-PT3A.
EXEC SQL
UPDATE TRST76.TBPT3A
SET TRUST_SECURITY_NBR = :IN-NEW-CUSIP-NO(from parm)
WHERE TRUST_SECURITY_NBR = :IN-OLD-CUSIP-NO(from parm)
END-EXEC.

8000-READ-INPUT-FILE.

MOVE 'GSAM1 - GN' TO XW05-FUNC-NAME
CALL 'CBLTINT' USING WC-IMS-GETNEXT
XB06
INPUT-RECORD.
MOVE XB06 TO XW05-XDBPCB
PERFORM 9790-CHECK-FOR-IMS-ERROR THRU 9790-CFIE-EXIT.
IF SUCCESSFUL-CALL = 'N'
MOVE 'Y' TO WS-INPUT-EOF-SW.

My doubt here is that WHAT DOES THE CHECKPOINT ACTUALLY DO?? . does it commit to the database or to the IMS system.??

What would happen if is give the commit in te following fashion.

2000-MAIN-PROCESS.
PERFORM 2100-UPDATE-PT3A THRU 2100-EXIT
PERFORM 2200-UPDATE-PT3B THRU 2200-EXIT
PERFORM 2300-UPDATE-PT3C THRU 2300-EXIT
PERFORM 2400-UPDATE-PT3D THRU 2400-EXIT
PERFORM 2500-UPDATE-PT3E THRU 2500-EXIT
PERFORM 9710-ISSUE-XPOINT THRU 9710-IX-EXIT
PERFORM 8000-READ-INPUT-FILE THRU 8000-EXIT

What would be the output in the above case..??

iknow · Posted: Tue Dec 20, 2005 11:48 am

Hi Salar,

Please stick to our forum rules. Post your queries under the concern section.

raghunathns · Posted: Tue Dec 20, 2005 7:57 pm

hi,

check point is used to store some info required by the program to restart again if there is any error.

second time it retrieves that info and start processing again.

I dont think it is like commit.