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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jul 19, 2017

RELATED IDEAS

make SQL cost estimation more accurate

DB2 for z/OS provided cost estimation before execution for each SQL.
We can use explain to check that. And DB2 governor (DB2 Resource Limit Facitliy) use the cost estimation for predictive governor.

How ever the cpu cost estimation is not correct for any sql with table space scan. It could be hundred times more than the real execution cpu time. With this, basically the predictive governor won't work any more - set a extremely high limitation basically defeat the purpose of RLF preditive governor.
(please refer to PMR 48943,057,649)

The SQL cost estimation need to be fixed, it should be closed to real execution CPU cost.
  • Admin
    Janet Figone
    Reply
    |     Sep 30, 2022

    Thank you for submitting this enhancement request. While we view all the enhancement requests we receive as valuable and we would like to implement all of them, in an effort to have maximum transparency we are not considering the ones that aren’t currently appearing on our 12 month product roadmap. This is not to say that these enhancements may not still be implemented at some point in the future as we do evaluate our requirements on the basis of customer demand and technical impact, to deliver maximum value to our customers.

    We appreciate your input to the Db2 for z/OS development team. And we hope that you will continue to submit enhancement suggestions 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

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