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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jun 5, 2013

Fix timeout errors during pending alter materialization reorgs

We're using DB2 z/OS V10 and tried using pending alter for making online schema change on an SAP table to increase a PBG table's DSSIZE from 4 GB to 64 GB. When we ran the SHRLEVEL CHANGE reorg to implement the pending alter, the reorg caused SAP transactions to get timeout errors against DSNDB06.SYSTSTSP. The problem was reported to IBM but we were told DB2 was working as designed.

The explanation we received was a pending alter materialization REORG needs to perform schema definition changes in the SWITCH phase. This requires invalidation of plans/packages/dynamic statement cache, and blockage of static/dynamic SQL from coming in while the REORG is changing the objects' definition. As a result, the traditional DRAIN ALL behavior performed on non-pending-alter materializing REORG is not sufficient (the IRLMRWT value is used). The dependency manager serializes the process of invalidating packages that takes place when DDL changes are made. There is no granularity on the type of change being implemented and each package or dynamic statement are invalidated serially.

We want SHRLEVEL CHANGE reorgs that materialize pending alters to have no impact to work being done by our business transactions.
  • Admin
    Janet Figone
    May 6, 2021

    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 closing the ones that don’t currently appear on our two year 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,

    The Db2 for z/OS Team