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Re: Optimising XPATH search performance

From: "Joe Fawcett" <joefawcett@-------.--->
To: NULL
Date: 12/3/2004 12:35:00 PM
"James Hahn" <JamesHahn@h...> wrote in message 
news:e1ylfOO2EHA.3336@T......
>I am processing an XML file where performance is important. Most of the 
>searching is for an element within the current node, but there is one point 
>where I have to do a SelectSingleNode from the document root, searching for 
>a unique ID, and I suspect this is a slow procedure.
>
> Does anyone know if there's a performance difference if this ID is an 
> attribute or an element? Is there any optimising I can do to ensure the 
> search is as efficient as possible?
>
> I could pre-process the file to de-normalize it, but for a typical data 
> set this about quadruples the size, and I fear that I will not get any 
> overall speed improvement.
>

In theory if the ID is declared as type ID in a DTD, and therefore an 
attribute, it will be found quicker. As Jonathon mentioned though an 
empirical test is fairly straightforward.

-- 

Joe (MVP - XML)


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