2651382 - Performance drop after adding a multi-column primary key involving unsigned bigint - SAP IQ | SAP Knowledge Base Article

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2651382 - Performance drop after adding a multi-column primary key involving unsigned bigint - SAP IQ

Symptom

Consider

  • 2 table schemas A(a1, a2, ..., an) and B(b1, b2, ..., bk)
  • Table A has a primary key on 2 columns: A(a1, a2) 
  • the following query:

SELECT *
FROM A JOIN B ON a1=b1 and a2=b2

After the primary key is changed to A(a1, a3), the query performance could drop considerably.


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Environment

SAP IQ 16.0

Product

SAP IQ 16.0

Keywords

"unique HG" ; HG(U) ; pkey ; , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed

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