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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.

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


Status Not under consideration
Workspace Db2
Created by Guest
Created on May 6, 2015

Control query parallelism by estimated SQL cost

Competing products (Oracle Database, Microsoft SQL Server) provide the ability to configure query optimizer in a way that it considers using query parallelism only when query complexity exceeds the configured threshold.

DB2 lacks that capability, as does not have a similar configuration parameter. It is also not possible to configure the similar behavior with DB2 WLM, because it is currently not possible to create a WLM threshold with the REMAP action based on ESTIMATEDSQLCOST parameter.

DB2 optimizer definitely contains some logic to decide on using query parallelism, but this logic is currently not configurable.