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What is checkpoint

 
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mainframe2me

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Joined: 07 Mar 2005
Posts: 5
Location: gurgaon

PostPosted: Thu Jun 23, 2005 11:10 am    Post subject: What is checkpoint
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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
my mail id is ***EMail ID REMOVED... Use CODE tag to include mail id***
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Mutthu_talluri

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Joined: 16 Jun 2005
Posts: 9

PostPosted: Thu Jun 23, 2005 11:27 am    Post subject: Re: checkpoint
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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.
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sudheer648

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Joined: 23 May 2005
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Location: Chennai

PostPosted: Thu Jun 23, 2005 12:48 pm    Post subject: Re: checkpoint
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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.
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sudheer648

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Joined: 23 May 2005
Posts: 97
Location: Chennai

PostPosted: Thu Jun 23, 2005 12:57 pm    Post subject: Re: checkpoint
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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.
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