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).


Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:


Search existing ideas

Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,


Post your ideas

Post ideas and requests to enhance a product or service. Take a look at ideas others have posted and upvote them if they matter to you,

  1. Post an idea

  2. Upvote ideas that matter most to you

  3. Get feedback from the IBM team to refine your idea


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


Add a new idea Subscribe
Status Delivered
Workspace Db2
Components BLU Acceleration
Created by Guest
Created on Jul 20, 2022

RELATED IDEAS

Bitemporal tables and missing highest quantiles

If a user issues FOR BUSINESS_TIME AS OF clause against a bitemporal table, DB2 translates it to a where clause with two range predicates against business_time columns.

In our system following situation occurs quite frequently:

1) At all times table has data with business_time end time = ‘9999-12-30’

2) RUNSTATS are executed with this clause ON ALL COLUMNS WITH DISTRIBUTION ON ALL COLUMNS AND DETAILED INDEXES ALL, but still manage to miss the highest quantile of ‘9999-12-30’

3) This leads to estimates of 1 / cardinality of the table and an inperformant access plan

For details see the case TS009699350.

Please adjust the quantile calculation algorithm for the business_time column, so highest value for the end time is always determined.


Needed By Quarter

By clicking the "Post Comment" or "Submit Idea" button, you are agreeing to the IBM Ideas Portal Terms of Use.
Do not place IBM confidential, company confidential, or personal information into any field.