Posted by MC on 01/26/06 09:25

Thank you for that, I assumed engine would 'optimize' that and never
checked. Just when I think I actually know something ;).....

MC


"Erland Sommarskog" <esquel@sommarskog.se> wrote in message
news:Xns9756F1F84A0F4Yazorman@127.0.0.1...
> MC (marko_culo#@#yahoo#.#com#) writes:
>> Do you mean that actually specifing servername slows down the query?
>> Could
>> you explain why?
>
> If the server name use is @@servername, SQL Server will shortcut, and
> there is no overhead.
>
> But if the linked server is defined a true loopback, so that there is a
> new connection made, there is obviously an overhead, as data is first
> passed to SQL Server, to the OLE DB provider on one connection, and then
> the OLE DB provider passes the data back to another connection.
>
> --
> Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
>
> Books Online for SQL Server 2005 at
> http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
> Books Online for SQL Server 2000 at
> http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

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