What is checkpoint

mainframe2me · New User Joined: 07 Mar 2005 Posts: 5 Location: gurgaon

hai all i want to know what is checkpoint please some body help me in this with out this iam not able to do a ticket please ehlp me in this
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Mutthu_talluri · New User Joined: 16 Jun 2005 Posts: 9

The application commits by issuing a checkpoint call.
At the time of the checkpoint, three actions take place:
IMS commits all the database updates and releases the
records for the checkpoint
IMS sends a message to the operator containing the ID of the
checkpoint
IMS writes a log record containing checkpoint information,
before and after images of the updated segments and the
checkpoint id.

Until the application issues the checkpoint, all segments which have been updated are ?enqueued? meaning any other programs attempting to access them will be forced to wait. If no checkpoints are taken, the commit will occur when the program completes.

sudheer648 · Posted: Thu Jun 23, 2005 12:48 pm Post subject: Re: checkpoint

Hi,

I accord with Mutthu and adding to it

This Checkpoint will allow you to restart the job from the Latest Checkpoint taken instead of starting from the Beginning of the Job incase of abend of your job due to some reason.

sudheer648 · Posted: Thu Jun 23, 2005 12:57 pm Post subject: Re: checkpoint

Hi,

http://publib.boulder.ibm.com/infocenter/dzichelp/index.jsp?topic=/com.ibm.ims.doc.apdb_8.1.0/ie0p3mst97.htm

Hope this helps you.

Let me know if any concerns in this regard.