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What is Check Point in DB2

 
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venkad1110

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Joined: 23 Feb 2005
Posts: 7

PostPosted: Mon Dec 05, 2005 3:25 pm    Post subject: What is Check Point in DB2
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Hi,

Can any one guide me about CHECKPOINT in DB2
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khamarutheen

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Joined: 23 Aug 2005
Posts: 680
Location: NJ

PostPosted: Mon Dec 05, 2005 4:36 pm    Post subject: Check point
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Hi frnd,

Code:
//DS1 DD DSNAME=DSN,DISP=OLD,CHKPT=EOV,
// UNIT=SYSSQ,VOLUME=SER=(TAPE)1,TAPE)2,TAPE)3)


In this example, the DD statement defines data set DSN, a multivolume QSAM or BSAM data set for which a checkpoint is to be written twice: once when end-of-volume is reached on TAPE01 and once when end-of-volume is reached on TAPE02.


hope enough...
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iknow

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Joined: 22 Aug 2005
Posts: 413
Location: Colarado, US

PostPosted: Mon Dec 05, 2005 8:30 pm    Post subject: Re: Regarding Check Point
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Hi Venkad1110,

As a follow up to Khamuruteen's posting I am adding some more information on Checkpoints.

Checkpoint in DB2

Batch jobs that do not regularly COMMIT their changes to DB2 risk excessive rollback times should they fail. Then, even after DB2 removes all work applied by the failing job, the original program must be rerun in its entirety after all problems have been corrected. Also, batch jobs that do not ever COMMIT database changes often use excessive DB2 resources and run longer than necessary.

Checkpoint/Restart allows you quickly insert COMMITs and CHECKPOINTS into your DB2 batch job streams – in some instances with- out even editing your programs. These COMMITs will often speed up DB2 batch programs and also free up DB2 resources for other production jobs that are running at the same time. After COMMITS are added to your DB2 batch programs, Checkpoint/Restart allows you to quickly restart any abended production job from the point of failure. Checkpoint/Restart will reestablish all positioning and resources within the problem program, including COBOL Working Storage and QSAM and VSAM file access; and then completes any remaining application processing rather than rerunning the whole DB2 program from the beginning.

Checkpoint Restart also provides a powerful Variable COMMIT Frequency Option that enables you to dynamically tune DB2 batch jobs by changing their COMMIT frequency as they run. Database Administrators can now dramatically speed up any jobs that need to be completed as soon as possible prior to the online DB2 applications being restarted.

NOTE

I have attached the Checkpoint process in a JPG format.

Please let me know in case of any concerns.
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iknow

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Joined: 22 Aug 2005
Posts: 413
Location: Colarado, US

PostPosted: Thu Dec 08, 2005 2:18 pm    Post subject: Re: Regarding Check Point
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Hi There,

You can always expect right information at the right time from ibmmainframes forum.

I am a part of it that's all man.
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