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Status Delivered
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Dec 2, 2020

RELATED IDEAS

Make the number of concurrent copies of plan cache SQLs a dynamically configurable parameter

We have a very serious need to increase the number of concurrent copies of SQLs in the plan cache well beyond the current hard-coded limit of 3 copies. We currently have 631 production schemas, each with the same database and SQLs. It's a separate-schema, multi-tenancy database.

Our plan cache is at full size, but has many old SQLs. I believe we are "spinning" the 3 copies of highly used SQLs, while leaving much of the cache stale. Increasing the number of copies of concurrent SQLs will allow more frequently used SQLs to take their place. Our plan cache hit ratio is regularly dropping below 80% and occasionally below 75%, because of this.

And, of course, we would like this to be dynamically configurable.


Use Case:

I'm not sure what you want for a use case, but I want to be able to change the number of copies allowed in the statement cache and have it take effect immediately.


Idea priority Urgent
  • Guest
    Reply
    |     May 14, 2021

    An enhancement was delivered in spring 2021 with IBM i 7.4 PTF Group level 13 and IBM i 7.3 PTF Group level 24 that should help with this type of plan cache situation.

    The QSYS2.CLEAR_PLAN_CACHE procedure was extended to allow clearing specific plans from the plan cache based on the QRO hash values and the plan identifier. This control allows you to remove plans that you believe should no longer be used.

  • Guest
    Reply
    |     Mar 9, 2021

    IBM will use this request as input to planning but no commitment is made or implied. This request will be updated in the future if IBM implements an enhancement for plan cache pruning.

  • Guest
    Reply
    |     Jan 16, 2021

    IBM will use this request as input to planning but no commitment is made or implied. This request will be updated in the future if IBM implements it.

    We are working with the submitter to understand the situation that occurred. We are also considering an enhancement to permit targetted user pruning of the plan cache.

  • Guest
    Reply
    |     Dec 14, 2020

    I see this has 7 votes now. What is the next process for this? When will IBM's DB2 team review this?

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