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Status Future consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Nov 12, 2025

Make it possible to change the SQE Temp Storage 7% Threshold

The current fixed SQE Temp Storage Threshold is set to 7%. I have no idea how long this value is in place, but my guess is that values was set to this values decades ago. Over the year the usage of temporary storage has grown on nearly every IBM i LPAR I have seen. Also the use of the IBM i Database has grown. 

With that in mind when looking at the plan cache details using the ACS SQL Performance Center I regularly see a date behind the the "Last Autosizing Limited Due to Temporary Storage" cased by the 7% rule. In some case the LPAR has a disk usage 80 to 90%, but in many cases this means that there is still an abundance of free disk space left. 

I know that the Plan Cache allows you to change the Plan Cache Configuration and change the Current Plan Cache Size Threshold form the default being *AUTO to a value in MB. The downside of this that after you made the change you need to monitor the size of the Plan Cache from the moment you so forever.  With that in mind the value *AUTO is the better option I think. If only IBM would make it possible to change that 7 % threshold ;-)

This idea is all about adding flexibility to the 7 % threshold in allowing us to change it. 

Idea priority High
  • Guest
    Nov 25, 2025
    IBM will use this Idea as input to planning, but no commitment is made or implied. This Idea will be updated in the future if IBM implements it.

    Db2 for i development team
    IBM Power Systems Development