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Status Not under consideration
Created by Guest
Created on May 5, 2023

On z/OS MQ ,,Develop a way to start trace when an SVC dump is produced

Typically when we submit SVC dump for analysis the dump doesn't have enough information and are asked to start trace and wait for issue to reoccur ,,,,

What would be nice is via some option that can be toggled to have trace started when SVC dump is produced and would capture added information,,,,

This would save cycles used by running a trace until the issue reoccurs....

Idea priority Medium
  • Admin
    Matthew Leming
    Sep 25, 2023

    Hi Steve,

    Without trace there is some basic information in the dump which can be used to figure some of what the abending task was doing. But not that much.
    Trace gives a lot more detail, and comes with an increased cost. However trace needs to be on prior to the dump to really get that value.

    I don't think what's being asked for here is really feasible without adding too much runtime cost, so I will decline this idea.

    Regards, Matt.

  • Guest
    Jul 7, 2023

    Hi Matt,,, As i don't have a clear understanding on what is actually collected via trace,,,,

    My thought was that when a dump occurs,, that there might be enough information to be gathered at that point on ? It would at least have some detail that could help point us in the right direction....

    Question is ,,, how often in troubleshooting dumps are the pertinent pieces of information prior to the dump more telling than durning/after the dump ?

    Maybe this just howling at the moon ,,,,

    Thanks for taking the time ,,,,,

  • Admin
    Matthew Leming
    May 25, 2023


    We only capture trace information when trace is on. So switching trace on at the point when the dump occurs will not capture any information leading up to the dump. It will just capture information from the point of the dump onwards.
    Is that what you were asking for - automatically switching trace on when the first dump occurs, so that if a second dump occurs we will have some trace?
    Or alternatively was the request for a small circular trace buffer that was always on so it could be dumped out? If so that's pretty close to what existing trace does and will come with the same, or similar performance impact.

    Regards, Matt.