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Covered Indexes

  • May 11, 2007 at 9:26 am

    #174039

    In SQL Server 2005 you can create covered indexes using the INCLUDE argument.  My question is this: Is this SQL Server 2005 specific feature or is it a SQL standard supported by such DBMS's as DB2, Oracle, etc?

     

  • May 13, 2007 at 11:48 am

    #706061

    Hi Lynn,

    The index column include is from Microsoft not ANSI, I think it is one of the best new features in SQL Server 2005 because it let you add columns to an index definition that may not qualify to be part of a key.  I call it implicit composite because it is not really a composite per ANSI SQL definition.  The vendors own the index subsystem so Microsoft tossed everything before 2005 and created a new infrastructure for 2005.

    http://msdn2.microsoft.com/en-us/library/ms190806.aspx

     

    Kind regards,
    Gift Peddie

  • May 13, 2007 at 1:16 pm

    #706065

    That helps.  It means that products like PeopleSoft aren't going to update their tools to take advantage of non standard enhancements like the INCLUDEd columns in indexes in SQL Server 2005 unless other DBMS providers decide to do the same or it becomes an ANSI standard.

    Thanks

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