XQuery is causing lots of disk writing

Hi,
In our system, we found that XQuery is causing lots of disk writing. I guess it is due to cache.
In dbxml document, it says:
All Berkeley DB XML applications are capable of writing temporary files to disk. This happens when the disk cache fills up and so BDB XML is forced to write overflow pages. For the most part, these temporary files can be safely ignored.
I don't understand what it says above.
My question is: Why Xquery operations will cause lots of disk write? (No other proocesses are writing bdb. )
Thanks.
-Yuan

Hi Yuan,
DB XML uses temporary Berkeley DB databases for a number of things during query evaluation, including re-sorting index entries and storing the parsed documents from a WholedocContainer format container. Berkeley DB will write this information out to disk if the cache becomes full. I would suggest that the behaviour you're seeing indicates that you need to allocate more cache for DB XML to work with.
John

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