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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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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.

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IBM Data & AI Roadmaps (http://ibm.biz/Data-and-AI-Roadmaps) - Use this site to view roadmaps for Data & AI products.

IBM Employees should enter Ideas at https://hybridcloudunit-internal.ideas.aha.io/


Status Not under consideration
Workspace Db2
Created by Guest
Created on Sep 21, 2015

Real-time statistics with statistics profile can lead to deadlocks and lock timeouts

DB2 real-time statistics facility honors RUNSTATS options specified in the statistics profile, while performing synchronous statistics collection during statement compilation.

If the statistics profile contains ALLOW READ ACCESS option, this can lead to additional table-level S-locks being acquired (and waited for) the table of interest. Depending on other executed statements, and, specifically, having an IX-lock on the same table due to previous DML activity in the same transaction, this can lead to lock timeouts and/or deadlocks of the synchronous RUNSTATS execution.

As a result, statement execution fails at the compilation phase with error SQL0911N.

A workaround is to avoid setting ALLOW READ ACCESS option in the statistics profile. However, this option might give benefits in other situations - such as asynchronous RUNSTATS execution performed by the automatic maintenance tasks.

It would be better if RTS would ignore the ALLOW READ ACCESS option during synchronous statistics collection, allowing this option to be set for use by automatic maintenance tasks.