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IBM Data and AI Ideas Portal for Customers

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:

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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,

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The IBM team may need your help to refine the ideas so they may ask for more information or feedback. The product management team will then decide if they can begin working on your idea. If they can start during the next development cycle, they will put the idea on the priority list. Each team at IBM works on a different schedule, where some ideas can be implemented right away, others may be placed on a different schedule.

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Status Delivered
Created by Guest
Created on Oct 13, 2014

Optimizer override like LIMIT ALL

IDAA is arbitarily choosing an optimizer path that is not very performing. We are executing a SQL statement that is finishing in less than 10s when it choose right access path but running over 90 min when it went with a wrong access path. IBM Netezza engineers explained that on a complex SQL it is arbitarily choosing the access path. Netezza has a way to override the optimizer generated access path by adding LIMIT ALL to the SQL statement.

However this parameter is not passed by DB2 and hence this option is not available for IDAA and hence leaving us in a very bad position.

We would like ability to override the optimizer generated access path, in the SQL, so that when we faced with issues, we can simply override the generated access path and follow the SQL statement path.
  • Guest
    Apr 14, 2021

    SQL Embedded Optimizer hints are available in Version 5 and Version 7. Please contact IBM Support for further details.