2290896 - ODBC: 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)

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