Skip to Main Content
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 (

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 ( - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal ( - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM. - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

IBM Data & AI Roadmaps ( - Use this site to view roadmaps for Data & AI products.

IBM Employees should enter Ideas at

Status Submitted
Workspace Informix
Components Informix Server
Created by Guest
Created on Mar 7, 2023

Sort data calculations should not be used to determine number of passes for UPDATE STATISTICS MEDIUM/HIGH statements where an index is used, fix misleading explain output

UPDATE STATISTICS MEDIUM/HIGH can be used with an explain option.

The explain file always shows a sort data calculation which then determines the number of table scans (passes) the database engine will undertake.

These are calculated before any decision the engine makes about whether to:

  1. use indices for sort;

  2. or scan the table, write to temporary files and sort these

to produce a distribution.

Even when indices will be used for sort and the sort data calculation is therefore irrelevant, it still influences the number of passes.

When indices are used for sorting other more appropriate criteria should be used to determine the number of passes and any parallelism. The explain output should also be improved not to display any information about sort data in this situation. This is misleading for users.

Needed By Quarter