IBM MAINFRAME HELP & SUPPORT FORUMS

sudhaaa · Joined: 24 Mar 2005 Posts: 47

HI all,

Can u please explain me how CHKP and XRST call be used? Why I need XRST,other than releasing CHKP. If it is so, where this XRST is so useful?

Suppose I issued CHKP for 1000 records, Then for every 1000 records updated(required function) will take place. Now I need a CHKP at 500 records at one site. Can I do this by modifying in Application program or in JCL(anything using HOLD)

shivasankar · Joined: 11 Jun 2005 Posts: 1

Hi Sudhaa,

XRST call should be issued to first before you issue CHKP call. That is to basically identify whether the job is restarted/or it is normal run(first time we normally start).

After issuing XRST call, the return value (XRST Work Area) is spaces, then it is normal start. If not, then it does mean that your job is restarted. In our application program there might be separate logic while restarting such as initialization of variable, then retrieve stored values from checkpoint save area etc.

Then if you want to change the chkp interval, you can do it by modifying the chkpoint interval value in ur application program. In jcl we can't specify chkp interval.

If you need any more details,let me know..

Friendly
Shiva

Jagamohan · Joined: 17 Jun 2005 Posts: 13 Location: Mumbai

hi sudhaa
for better understanding u can refer this.
http://publib.boulder.ibm.com/infocenter/dzichelp/index.jsp?topic=/com.ibm.ims.doc.apdb_8.1.0/ie0p3mst97.htm

kotesh · Joined: 11 May 2005 Posts: 14

hi sudha,
what ever you have given that is good i want to add something extend
basically there are two types of checkpoints are there 1. basic checkpoint

2.symbolic check point ..
the diff is basic chkp does not have restart facility ,symbolic having restart facility........i donot have time ..i will add some info tomorrow..

ok
byeeeeee

prasanth_thavva · Joined: 28 Jul 2005 Posts: 103 Location: Bangalore

sudha,

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