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  • Stress testing UPSERTs

    Suppose that you need to implement the following logic: IF(row exists)   Update the row ELSE  Insert a new row. If you already are on 2008, you should use MERGE command, and you don’t need to read this post. Prior to 2008 this logic has to be implemented using UPDATE and INSERT commands. I will stress test several ...
    Posted to Alexander Kuznetsov (Weblog) by Alexander Kuznetsov on December 14, 2008
  • Fun with DBCC CHECKIDENT

    <Denis Gobo’s mode on> Suppose you have an empty table:   SELECT COUNT(*) FROM SampleTable --- 0   What would be the result of the following query:   DBCC CHECKIDENT('SampleTable', RESEED, 1) INSERT SampleTable(j) SELECT 1 SELECT SCOPE_IDENTITY()   <Denis Gobo’s mode ...
    Posted to Alexander Kuznetsov (Weblog) by Alexander Kuznetsov on June 26, 2008
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