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Steve CoxSubject: Large xquery dataset.
Author: Steve Cox
Date: 28 Nov 2005 09:30 AM
Hi,

I was experimenting with what was effectively a left outer join of two datasets with about 15,000 records each - sharing a key.

I used an xquery for the join similar to:

for $row in /Contact1/row,
$row1 in /Contact2/row
where $row/ACCOUNTNO = $row1/ACCOUNTNO

and pulled out most of the fields for each row (10-15 fields per dataset).

Doing this on a database system where the key is indexed takes 10-15 seconds, using xquery within stylusstudio took nearly 3 hours on a 1GB 3GHz Pentium4. I was wondering if there is any way to speed this up - maybe defining keys in each dataset?

Thanks.
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(Deleted User) Subject: Large xquery dataset.
Author: (Deleted User)
Date: 28 Nov 2005 10:03 AM
Steve,
These types of optimizations depend entirely on which xquery processor you are using. The Stylus Studio xquery processor has been built as a tool to design, test, and debug xquery programs. Users are normally expected to deploy the application on a different xquery processor which has been designed to be efficient in a production environment.

For you example, the DDXQ xquery processor would optimize this query quite nicely. We suggest you view the video tutorial at:

http://www.stylusstudio.com/videos/ddxqdemo/datadirectxquery.html

Thanks for your comments.
Clyde

 
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