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3041310 - Wrong result set when using Merge Join and Parallel Processing - SAP ASE

Symptom

A specific query was not returning rows when using optimzation goal "allrows_mix". The scenario was the following:

  • Query returns rows when using optimization goal "allrows_oltp". The showplan was indicating the use of MERGE JOIN and Serial Mode.
  • Query doesn't return rows when using optimization goal "allrows_mix". The showplan was indicating the use of MERGE JOIN and Parallelism.
  • Query return rows when using optimization goal "allrows_mix" after running update index statistics. The showplan was indicating the use of NESTED LOOP JOIN and Parallelism.

Problem solved by executing update statistics.


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Environment

SAP ASE 16.0 SP03 PL07

Product

SAP Adaptive Server Enterprise 16.0

Keywords

wrong result set MERGE JOIN parallelism parallel serial mode allrows_mix consumer process CR 824432 CR824432 , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed

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