IBM Mainframe Forum

[vinay_a01]

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

[Bill Dennis]

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.

[vinay_a01]

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

Can u tell me more on this?

[dick scherrer]

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.

[vinay_a01]

got it

Thanks