HI Sergio,
in an experiment that does some SPARQL queries to our Virtuoso instance,
many with string operations (mainly FILTER), and the time required to do
this operations is really bigger that others. I know that the complexity
of this algorithsm is big, but not so much...
The questions comes because problably there are some configuration to
improve this kind of things.
I'm using Virtuoso Open Source Edition (5.0.7).
The explain function can be used to see the query plan. Use the isql
command to connect to your database then:
SQL> explain ('sparql .........');
Depending on your query, you may need to add additional indexes for the
quad store.
It would be really helpful if you could send me some samples queries of
what you are trying to accomplish, so i can discuss them with the
relevant developers.
You can either send them to the mailing list, or just to my account
vos.ad...@openlinksw.com
Patrick
