Thanks to all on their comments and info. I wanted to follow up on Rumi's
comment:
"http://live.dbpedia.org/sparql is currently pointing to
http://dbedia-live.openlinksw.com/sparql so contain the same data.
This data is updated regularly with the latest changes from Wikipedia itself."
If the 2 end points for live data contain the same data then how come the query
in my first email return such varying result (one returns a count of ~ 3
million while the other returns a count of ~63 million)?
Based on Juan's comment about, I also tried querying for a smaller subset and
see different results here as well. The query I used is:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dbpprop: <http://dbpedia.org/property/>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dbpprop: <http://dbpedia.org/property/>
SELECT ?wikiPageID count(*)
FROM <http://dbpedia.org>
WHERE
{ ?person rdf:type dbo:Person .
?person dbpprop:name ?name .
?person dbo:birthDate ?birthDate .
?person dbo:abstract ?abstract .
?person dbo:wikiPageID ?wikiPageID .
?person dbo:wikiPageRevisionID ?wikiPageRevisionID
OPTIONAL
{ ?person dbo:wikiPageModified ?wikiPageModified }
OPTIONAL
{ ?person dbo:wikiPageExtracted ?wikiPageExtracted }
FILTER langMatches(lang(?abstract), "en")
FILTER (?wikiPageID = 365352 || ?wikiPageID = 39972083)
}
GROUP BY ?wikiPageID
On http://live.dbpedia.org/sparql it shows:
wikiPageID callret-1
39972083 8
On http://dbpedia-live.openlinksw.com/sparql it shows:
wikiPageID callret-1
39972083 2
365352 544
Why is that happening?
~ Shruti
On Friday, June 27, 2014 7:39:39 AM, Kingsley Idehen <kide...@openlinksw.com>
wrote:
>
>
>On 6/27/14 9:52 AM, Rumi wrote:
>
>Hi Juan,
>>
>>On 27-Jun-14 9:06 AM, Juan Lucas Domínguez Rubio wrote:
>>
>charset=unicode" http-equiv=Content-Type>
>Hello,
>Very surprising results. The difference is so big that if you choose a random
>resource from the large result set, then it will probably not exist in the
>small result set. Have you tried?
>
>By the way, how do the live endpoints (http://live.dbpedia.org/sparql,
>http://dbpedia-live.openlinksw.com/sparql) compare to the standard endpoit
>(http://dbpedia.org/sparql) in terms of:
>
>- Amount of data
>- Response time
>- Availability
>
>Anybody knows about that?
>http://live.dbpedia.org/sparql is currently pointing to
>http://dbedia-live.openlinksw.com/sparql so contain the same data.
>This data is updated regularly with the latest changes from
Wikipedia itself.
>
>Statistics on the update process can be found at
>http://dbpedia-live.openlinksw.com/live/
>
>http://dbpedia.org/sparql/ is based on the 3.9 dataset as published by the
>dbpedia team.
>It is a static dataset that is refreshed about once a year ...
>
>So live.dbpedia.org has the newest data but in some cases
dbpedia.org has some extra data from other datasets that live will
not have.
>
>As for Response time and Availability, it is a best effort
project, so we make sure it runs most of the time, but we will not
give guarantees for uptime and availability.
>
>There are rate limiters and ACLs in place to make sure everyone
gets a fair shot at running queries.
>
>Those limits can cause problems for certain kind of analysis as
such queries may timeout before giving meaningful data back.
>In such cases we strongly recommend users to setup a version of
dbpedia in the cloud so they can have the same data but without
competing with queries from other users.
>
>Hope this helps.
>
>
>Best Regards,
>Rumi Kocis
>One little addition to what Rumi stated above, you can also try the
instance at: <http://lod.openlinksw.com> which provides a LOD Cloud cache.
Naturally, this will not be as up to date as the DBpedia-Live instance in
regards to data transformed from Wikipedia documents etc..
>
>
>-- Regards, Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com Personal Weblog:
http://www.openlinksw.com/blog/~kidehen Twitter Profile:
https://twitter.com/kidehen Google+ Profile:
https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile:
http://www.linkedin.com/in/kidehen
>
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