I use the QLever Wikidata SPARQL service at https://qlever.cs.uni-freiburg.de/wikidata/ The Virtuoso service I use is at https://wikidata.demo.openlinksw.com/sparql I believe that both of these are the standard endpoints and are the same that you used.
peter
On 10/9/24 14:21, Kingsley Idehen via Wikidata wrote:
Hi Peter,
On 10/9/24 11:26 AM, Peter F. Patel-Schneider wrote:
Here is a query that I wanted to evaluate:
SELECT ?sub ?super WHERE { ?sub wdt:P279+ ?super . }
Fine on QLever, fails immediately on Virtuoso, times out in Blazegraph.
Please share the Virtuoso SPARQL endpoint URL for this query. That's enables a common start point. In addition, what's the SPARQL service endpoint for the QLever instance you are using?
Kingsley
It would be a good idea to collect wanted but difficult queries to help inform the WDQS team when they finally replace Blazegraph. I have over 60 queries that I ran during investigations of the Wikidata ontology. Some of them were too tough for QLever and quite a few were pieces of the too-tough queries that I then combined the results of.
peter
On 10/9/24 10:43, Kingsley Idehen via Wikidata wrote:
Denny and others,
Here’s my basic goto query for SPARQL.
|SELECT (SAMPLE(?s) as ?sample) (count(*) as ?count) ?o WHERE {?s a ?o} GROUP BY ?o ORDER BY DESC (?count) LIMIT 20 |
SPARQL Results Links:
1.
2.
QLever’s Endpoint doesn’t handling this, assuming https://qlever.cs.uni-freiburg.de/wikidata/sk8I2D is the correct one.
What am I missing here?
Kingsley
On 10/9/24 10:31 AM, Kingsley Idehen via Wikidata wrote:
HI Denny,
On 10/2/24 5:05 AM, Denny Vrandečić wrote:
The most promising show of "we are ready" for the Virtuoso Open Source edition would be what QLever has been doing for a while: to provide a public endpoint with the data loaded, and kept up to date using the public edit stream. That would be an undeniably strong argument for "just use this!"
Aren't you aware of the public endpoints we've provided for years?
[1] https://wikidata.demo.openlinksw.com/sparql
[2] https://wikidata.demo.openlinksw.com/fct
That's VOS based.
Is there something that's missing etc?
Kingsley
On Thu, Sep 26, 2024 at 4:32 PM Samuel Klein meta.sj@gmail.com wrote:
An updated benchmark eval (or self-evals) for the top db candidates seems called for :) we would all love to see it.
Ideally with a canonical hardware or vm spec that all can use...
I don't know if the QLever self-eval from the spring is the right place to start, but I believe these https://ad-research.cs.uni-freiburg.de/benchmarks/wdqs-queries/ are the ~300 queries they used for a Wikidata benchmark.
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Kingsley Idehen Founder & CEO OpenLink Software Home Page:http://www.openlinksw.com Community Support:https://community.openlinksw.com Weblogs (Blogs): Company Blog:https://medium.com/openlink-software-blog Virtuoso Blog:https://medium.com/virtuoso-blog Data Access Drivers Blog:https://medium.com/openlink-odbc-jdbc-ado-net-data-access-drivers
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