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Status Delivered
Workspace Db2 Analytics Accelerator for z/OS
Created by Guest
Created on Oct 13, 2014

RELATED IDEAS

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
    Reply
    |     Apr 14, 2021

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

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