IBM Data and AI Ideas Portal for Customers
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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).


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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


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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on Apr 19, 2024

RELATED IDEAS

Improve Space Search Performance for Nearly Full PBR

See this idea on ideas.ibm.com

Currently, when there are many concurrent inserts on a PBR which is nearly full, CPU and elapsed time for inserts increases by many orders of magnitude, to the point where it can completely monopolize the CPU on an LPAR.

In past discussions, I was told that when the space search for each thread reaches the end of the partition, it goes back to the beginning of the partition and starts scanning forward from there. If there are multiple concurrent threads, they are all searching the same pages, the early pages in the partition get used up quickly, so more and more pages need to be scanned, and things fall over very quickly.

A potential solution would be to change the starting point for threads, so that they don't all go back to the beginning of the partition after hitting the end. Even something as simply as choosing a random page and searching forward from there would provide substantial relief.

Needed By Quarter

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