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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).


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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.

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IBM Employees should enter Ideas at https://ideas.ibm.com


Status Submitted
Workspace Db2
Components Monitoring
Created by Guest
Created on Jul 9, 2024

Include Prefetch wait time Metrics in monreport.dbsummary() stored procedure

Prefetch wait time numbers are a bit similar to FCM in the sense that they can be really high even in a normal system.

Prefetch wait time doesn’t start until an agent attempts to read a page that has already been queued for prefetch – then the clock starts.

Some amount of prefetch wait time is very normal, since the reason a prefetch request was made was that the page was going to be needed by an agent shortly.

Zero prefetch wait time is often a sign that prefetch isn’t happening at all, and that’s not always a good thing.

If prefetch wait time dominates, then that’s probably a sign that you should look into how prefetching is configured (number of prefetchers, extent size, prefetchsize) and at the configuration & performance of the storage system

Needed By Quarter