Corey Lovitt wrote:
Hi,
I've been working with virtuoso for a couple weeks now and have been
able to load a test RDF data file into the quad store (subset of the
UNIPROT dataset containing about 2.6 million triples) and query it
with good success. I had saved the loading commands as well as SPARQL
queries for the database so they were reusable.
In testing the system, I shutdown the virtuoso-t server, deleted the
db-files as well as the trx and the pxa files and then brought the
server back up. I then did a full reload of the dataset.
I'm now struggling with query performance on what seem to be very
basic queries and am looking for suggestions to help resolve them.
I've loaded the same dataset and reused the coded SPARQL queries it.
My original install was I believe into a vanilla quadstore (no special
indexes in place). I believe the query is being done on exclusively
local data - if this assumption is wrong it may explain the
performance issue - really don't understand how the caching aspect of
this system work and may be tripping on this.
Can folks suggest any way to check this (my packet sniffer isn't
showing anything obvious).
I can provide the explain output for an example query if this would be
useful.
Any suggestions would be _really_ appreciated.
Corey
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Corey,
What indexes do you have in place ?
What RDF data loading guide did you use and follow?
--
Regards,
Kingsley Idehen Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO
OpenLink Software Web: http://www.openlinksw.com
