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How function will get execute internally in sql server?

  • September 6, 2011 at 10:01 pm

    #256631

    HI All ,

    Can any one please explain me how function will get execute internally in sql server?

    With Thanks and regards,

    Ravindranath.S

  • September 7, 2011 at 12:42 am

    #1377787

    Much the same way as a stored procedure or ad-hoc SQL batch.

    What exactly are you looking for?

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

  • September 7, 2011 at 12:52 am

    #1377791

    Actually my sql statment like this

    SELECT DISTINCT UPP.ProductID,dbo.fnGetProductTestStatus(UPP.ProductID,@UserID) AS EndDate ,

    FROM #UserProductProgression UPP

    when i say like that how internally it execute inside the server .

    IS that a good practice to use function like that ?

    Performance wise any impact ?

  • September 7, 2011 at 1:03 am

    #1377794

    IS that a good practice to use function like that ?

    Performance wise any impact ?

    You will have a performance impact. This is explained well here (including details on how this gets executed internally) -> http://sqlblog.com/blogs/adam_machanic/archive/2006/08/04/scalar-functions-inlining-and-performance-an-entertaining-title-for-a-boring-post.aspx

  • September 7, 2011 at 1:08 am

    #1377798

    Thank you very much

  • September 7, 2011 at 3:48 am

    #1377855

    ravindranath.s (9/7/2011)

    Actually my sql statment like this

    SELECT DISTINCT UPP.ProductID,dbo.fnGetProductTestStatus(UPP.ProductID,@UserID) AS EndDate ,

    FROM #UserProductProgression UPP

    when i say like that how internally it execute inside the server .

    IS that a good practice to use function like that ?

    Performance wise any impact ?

    It really depends on what that function is doing and how well it's written the degree to which it will impact performance.

    Have you looked at the execution plan for the query? That's part of how you can tell what's happening inside the system.

    "The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
    - Theodore Roosevelt

    Author of:
    SQL Server Execution Plans
    SQL Server Query Performance Tuning

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