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Status Not under consideration
Workspace Db2 Utilities Suite for z/OS
Created by Guest
Created on Jul 25, 2023

RELATED IDEAS

Change behavior of option PARALLEL(0) for REORG TABLESPACE

We had a problem recently when a reorg of a tablespace with 100 partitions consumed far too much real storage. We ran the reorg with PARALLEL(0) and it choose to use 188 parallel tasks. That was probably OK at the beginning of the execution but not ten minutes later. It consumed far too much real storage.

This made me realise that the meaning of PARALLEL(0) is different between COPY and REORG. In COPY when using PARALLEL(0) the number of parallel tasks would be constrained by the value of PARAMDEG_UTIL. In REORG the PARAMDEG_UTIL value has no effect on the number of parallel tasks.

I suggest that REORG TABLESPACE is changed so that PARALLEL(0) means the same as for COPY, that is Db2 decides on the number of parallel tasks, but the maximum value is constrained by the value of PARAMDEG_UTIL.

It is much easier for us, especially when using automation, to let Db2 deside on the number of parallel subtasks. But we need to set the maximum value ourselves.

Needed By Quarter
  • Admin
    Chris Pomasl
    Reply
    |     Oct 17, 2023

    Thank you for submitting this Db2 Utilities Suite for z/OS enhancement request.

    After giving the request a comprehensive review, we have determined that we cannot include it as a candidate in an upcoming deliverable because it would adversely impact a Large number of our clients. Consequently, we will not be implementing this request.

    Historically, the hierarchical order is that a utility keyword option overrides the default value denoted by a subsystem level zPARM. That is why REORG honors the PARALLEL(0) specification as in no limit, and would not examine the zPARM PARAMDEG_UTIL value when PARALLEL(n) keyword is specified. The suggested behavior would eliminate the only keyword override available if user needs a specific utility job to execute past the global PARAMDEG_UTIL limit. While the development team acknowledges the inconsistent utility behaviors today, we actually consider the current COPY utility behavior to be incorrect.

    We appreciate your input to the Db2 Utilities Suite for z/OS development team. We also hope that you will continue to submit ideas for improvements as customer feedback is a key component to shaping the future direction of Db2 Utilities Suite for z/OS.

    Sincerely,

    Db2 Utilities Suite for z/OS Team

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