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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Status Not under consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Jun 5, 2014

RELATED IDEAS

Would like OPT_SEEK_FACTOR as a session set environment option

In 11.70, a new "seek cost" component for index costing was introduced, the purpose of which was to more accurately reflect the cost for seeking in an index scan (when index is not clustered) for large indexes.

OPT_SEEK_FACTOR is an undocumented ONCONFIG parameter that can be used to adjust the effect of this new seek component on the index scan costing. It's an integer that can be set to a value between 0 and 25, with a default setting of 6. If it's set to 0, then no seek component is added, which is the same as the costing would be in 11.50.

The DBA would like to test the impact of the OPT_SEEK_FACTOR on selected queries by setting a session environment variable instead of setting OPT_SEEK_FACTOR for the entire instance and have it affect all the queries on the production instance.

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