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2732381 - Wrong index being selected when statement cache is turned on - SAP ASE

Symptom

A simple update statement generates a different plan with statement cache on verses statement cache off:

UPDATE mydb..mytable 
        SET  duration  = c.duration
        FROM #chunk c,
             mydb..mytable p
        WHERE p.asof_date = c.price_date
        AND   p.cusip     = c.cusip

Why is this happening?


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Environment

  •  SAP Adaptive Server Enterprise (ASE) 15.7
  •  SAP Adaptive Server Enterprise (ASE) 16

Product

SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0

Keywords

table scan, query plan, optimization goal , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed

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