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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jun 26, 2018

RELATED IDEAS

optimiser to consider workfile size to determine to use a sort operation

Hi, were coping with a -904 00C90084 or 00C90085 DSNDB07 during a simple left outer join.

Apparently the optimiser is not smart enough to determine wether or not to use a sort operation because his lack of knowledge about the sort work file allocation.
Is it possible to smarten the optimiser and make him decide based on the size of the sort file allocation ? Is it is not possible to 'see' the sort file allocation, you can use fe. the MAXTEMP dsnzparm ?
For me this is a basic thing in good optimizer working.
  • Admin
    Janet Figone
    Reply
    |     Apr 17, 2023

    Dear Jeroen,

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

    After conducting a prototype of a Db2 feature to block such big sorts as you requested, the test results reveal performance regression risks on other queries. This risk outweighs the benefits. Therefore, we have determined that we cannot include this in an upcoming product deliverable and have moved it to not under consideration.

    We appreciate your input to the Db2 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 for z/OS.

    Sincerely,

    Db2 for z/OS Team

  • Guest
    Reply
    |     May 24, 2021

    Optimizer can NOT block an access path based on workfile size because bindtime size estimation can be very different from runtime actual numbers.

    On the other hand, something can be done by cutting the lifespan of individual workfiles. With less workfiles active concurretly, this will certainly reduce -904.

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