1893019 - Query with a subquery is slower in v.15.7 than v.12.5.x because reformatting strategy is not chosen - SAP ASE | SAP Knowledge Base Article

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1893019 - Query with a subquery is slower in v.15.7 than v.12.5.x because reformatting strategy is not chosen - SAP ASE

Symptom

  • SAP Adaptive Server Enterprise  (ASE) 15.x optimizer may not choose the reformatting strategy if a query contains a subquery and tables have no useful index.
  • As a result, ASE 15.x may run the query slower than ASE 12.5.x.

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Environment

SAP Adaptive Server Enterprise (ASE) 15.7

Product

SAP Adaptive Server Enterprise 15.7

Keywords

performance, optimizer, compatibility, compatibility_mode , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem

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