Hi Andy,
my assumption is that the doc() gives you better results because it
creates a main-memory representation of the document, which can
generally be processed faster than a persistent database
representation.
If I remember right, the XMark queries 11 and 12 contain a
non-equi-join, which lead to frequent lookups of the same data, and
for which BaseX provides no optimization yet. All other XMark queries
are probably evaluated faster on the database, in particular when
larger XMark instances are used for testing.
Hope this helps, feel free to ask for more,
Christian
___________________________
2013/7/2 Andy Bunce <bunce.andy@gmail.com>:
> _______________________________________________> Hi,
>
> Looking to compare the performance of BaseX on a number of machines I have
> been running the Xmark queries [1]. Query 11 seems to be one that causes the
> most stress. I then compared the performance executing query 11 against an
> xml file on the filesystem compared with importing it into a database and
> timing the query against the database:
>
> * Running from a database 36sec
> * Running from a file 9secs
>
> The xml was generated using
> xmlgen /f 0.1 /o test.xml
>
> This does not seem right to me. I was expecting the database to be faster.
> /Andy
> [1] http://www.ins.cwi.nl/projects/xmark/Assets/xmlquery.txt
>
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