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://hybridcloudunit-internal.ideas.aha.io/


Add a new idea Subscribe
Status Submitted
Workspace Db2
Components Statements (DDL and DML)
Created by Guest
Created on Mar 22, 2023

RELATED IDEAS

Optimizer does not use HIGH2KEY/LOW2KEY for columns with COLCARD 1

Optimization issue if a business_time_oriented table  has only one row. In syscat.columns the content of the business_time columns are detected (high2key, low2key) but the value can not be found in the distribution statistics. This leads default filter factors (1/3) of the to business time predicates and in sum to a way too small filter factor.  This leads to a MSJOIN with a low filtering join-predicate (which we don't like eather. The statistics would be needed to be brought into syscoldist? Omiting sampling was not successful.

This single row table was not the the main source of the cardinality under-estimation error in the original query they provided.

The issue here is that the optimizer does not use HIGH2KEY/LOW2KEY for columns with COLCARD 1.

This is a known issue and certainly something that needs to be be improved,

Needed By Quarter

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