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Status Submitted
Workspace Cognos Analytics
Created by Guest
Created on Jan 11, 2023

Advanced query hint to use 'Group By' instead of 'Distinct' in SQL

In some cases, we would need an advanced query hint to use “Group By” instead of “Distinct” in the SQL per report or per query tree. We are aware of the DQM query property “performance.convertGroupByToDistinct” which is set to “true” by default (file ../configuration/xqe/ But we don’t want to change this option in general because this causes further issues (e.g. “query is too long or too complex”).

We’re also aware of the workaround to insert a “GroupBy-Dummy” in every query. But this is very time consuming.

We would need a simple option per report or query tree to switch from “Distinct” to “GroupBy”. Sometimes "Group By" can be processed faster by the database and sometimes "Distinct".

Background is that DB2 has a performance issue with DISTINCT in some cases.

Needed By Week