What is use of CHECK POINTS ?



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What is use of CHECK POINTS ?

Postby vinay_a01 » Fri Feb 20, 2009 11:14 pm

What is the use of CHECK POINTS ? Can anyone explain me more on this ?
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Re: What is use of CHECK POINTS ?

 

Re: What is use of CHECK POINTS ?

Postby Bill Dennis » Fri Feb 20, 2009 11:30 pm

Back in the good old days, processors were much slower and some jobs would run for days. Checkpoints allowed you to cancel a job and restart later at the previous checkpoint. The files would reposition themselves and the program resumes processing. Checkpoints would be timed to occur every few hours.
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Bill Dennis

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Re: What is use of CHECK POINTS ?

Postby vinay_a01 » Fri Feb 20, 2009 11:33 pm

what do you mean by " Checkpoints would be timed to occur every few hours. "

Can u tell me more on this?
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Re: What is use of CHECK POINTS ?

Postby dick scherrer » Sat Feb 21, 2009 2:01 am

Hello,

In the jobs Bill mentions, the program would determine how long it had been running since the last checkpoint. If the specified amount of time had elapsed, a new checkpoint was issued.

Another way ckeckpoints are used is at the end of a logical "unit of work" (LUW).

The reason for checkpoints is usually to support recovery/restart.
Hope this helps,
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Re: What is use of CHECK POINTS ?

Postby vinay_a01 » Sat Feb 21, 2009 2:06 am

got it

Thanks :)
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