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2290896 - sp_drv_getcomment bad plan causing large increase in logical i/o's - SDK for SAP ASE


  • The sp_drv_getcomment user-defined function (UDF) is one of the heaviest hitters we've seen on top since upgrade.
  • This is a user-defined function called via sp_drv_bcpmetadata (primarily).
  • It ends up calling the UDF for every column of every table being inserted into and it does a table scan of <temporary database>..syscomments.
  • It is being executed to check whether a column has a default or not (to retrieve its text).
  • As a result, this function is responsible for about half a billion logical i/o's every hour.



  • SAP Adaptive Server Enterprise (ASE) 15.7
  • SAP Adaptive Server Enterprise (ASE) 16.0
  • SAP Sybase Software Developers Kit (SDK) 15.7
  • SAP Software Developers Kit (SDK) for Adaptive Server Enterprise (ASE) 16.0
  • Adaptive Server Enterprise ODBC Driver by Sybase
  • jConnect
    • JDBC 7.07
    • JDBC 16 (is version JDBC 7.07)


SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0 ; SAP Adaptive Server Enterprise SDK 16.0 ; Sybase Software Developer Kit 15.7


odbc, CR796657, CR#796657, 796657,  performance , KBA , BC-SYB-SDK , SDK , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed

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