IBM Data and AI Ideas Portal for Customers
This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).
Shape the future of IBM!
We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:
Search existing ideas
Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,
Post your ideas
Post ideas and requests to enhance a product or service. Take a look at ideas others have posted and upvote them if they matter to you,
Post an idea
Upvote ideas that matter most to you
Get feedback from the IBM team to refine your idea
Specific links you will want to bookmark for future use
Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.
IBM Unified Ideas Portal (https://ideas.ibm.com) - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM.
ideasibm@us.ibm.com - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.
IBM Employees should enter Ideas at https://ideas.ibm.com
But for PBGs there are no key ranges at partition level!
Hello,
So yes, parallelism can put key ranges into the access path, and so can limited partition scan. Reorg rebalance, insert partition, alter table rotate part,
Best regards,
Pat Bossman
A similar issue occurs with the Reorg Rebalance, why does it set VALID='N' for all related packages?
Sergi.
ahh now I understand why MAXPARTITIONS can have an impact. But at what level? If I define a MAXPARTITIONS at say 256 is it seriously going to assume I can run with 256 parallel sub-tasks?? Surely not! I could believe this with up to 16 but above that I cannot really think it is ever used...
Per IBM the reason that the packages are invalidated due to parallelism. But I'd like to recommend that if the packages are bound with Degree(1), that they are not invalidated.
When parallelism build a parallel group partitioned on page range, it will use the current defined MAXPARTITIONS as the high bound (the maximum partition or pages can the table have). So, when MAXPARTITIONS increase, then any newly added partitions will be out-of-the-parallel-group-scan-boundary. Hence, causes incorrect output (whatever the data resides in the newly added partitions, will never have a change to be examined). In order to correct the behavior, we request the previous bound parallel plan to be rebound(invalidate the package for a rebind) to make sure we cover the newly defined/added partitions.
On the other hand, if the MAXPARTITIONS is decreased, then the parallel group will still cover the whole range and Date Manager guarantee that if the needs to be scanned page/partition is over the maximum physical page/partition, it will simply returns EOF. So, no re-bind needed in this path.
Hope this answer your question. Please let us know If you have any further question or concern.
With only impact to catalog, not sure how Access Path would be impacted. Seems wasteful and counter productive to invalidate packages.
I opened a Case on this asking why packages are being invalidated in this situation and it is still open waiting for a reply.
this is just a limit in the catalog. So how could access path be affected ? The actual growth of a partition doesn't invalidate the package so how just changing the limit do so ?