SAP Knowledge Base Article - Preview

3070870 - Query performance issue after upgrading to 16 SP11.28 from version 15.4 - SAP IQ


  • When selecting join algorithms for a right or full outer equijoin operator, if the join predicate was on varchar columns of the same declared length then the optimizer might not consider the predicate acceptable for hashing.
  • As a result, the optimizer either may not choose hash-based algorithms for the join or it could choose a hash join with a poorly-performant hash function based on a subset of the join columns. 



  • SAP IQ 16.1
  • SAP IQ 16.0 


SAP IQ 16.0 ; SAP IQ 16.1


 CR824420, CR#824420, 824420 , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed

About this page

This is a preview of a SAP Knowledge Base Article. Click more to access the full version on SAP for Me (Login required).

Search for additional results

Visit SAP Support Portal's SAP Notes and KBA Search.