Hi All,

Regarding these FAIR use settings. They are tuneable and maybe turned off, so the specific
values that Openlink uses may or may not be used if wikidata would host itself a virtuoso instance.

e.g. for sparql.uniprot.org you are unlikely to run into these limits (as the values are set very high indeed)
and are more likely to suffer from settings around the http layer that limit query run time due to connection issues.

Regards,
Jerven

On 1/12/23 11:45 PM, Kingsley Idehen via Wikidata wrote:

On 1/12/23 3:39 AM, Larry Gonzalez wrote:
Dear Kingsley,

Let me start saying that I appreciate and thank the effort of loading complete wikidata over a graph database and make and sparql endpoint available. I know it is not an easy task to do

I just tried out the new virtuoso-hosted sparql endpoint with some queries. My experiments are not exhaustive at all, but I just wanted to raise two concern that I detected

Considering a (very simple) query that count all humans:

'''
SELECT (count(?human) as ?c)
WHERE
{
  ?human wdt:P31 wd:Q5 .
}
'''

I get a result of 10396057, which is ok considering the dataset that you are using

But if we try to export all instances of human (on a tsv file) with the following query:

'''
SELECT ?human
WHERE
{
  ?human wdt:P31 wd:Q5 .
}
'''

Then I only get 100000 results. Is there a limit over the number of results that a query can have?


Yes, because these services are primarily for ad-hoc querying rather than wholesale data exports. If you want to export massive amounts of data then you can do so using OFFSET and LIMIT.

Alternatively, you can instantiate your own instance in the Azure or AWS cloud and use as you see fit.

Like what we provide regarding DBpedia, there's a server side configuration in place for enforcing a "fair use" policy :)




Furthermore, if we want to get all humans ordered by id, then the endpoint times out. The following is the query:

'''
SELECT ?human
WHERE
{
  ?human wdt:P31 wd:Q5 .
}
ORDER BY DESC(?human)
'''


If you set the query timeout to a value over 1000 msecs, the Virtuoso Anytime Query feature will provide you with a partial solution which you can use in conjunction with OFFSET and LIMIT to creative an interactive cursor (or scrollable cursor). Beyond that, its back to the "fair use" policy and option to instantiate your own service-specific instance using our cloud offerings.


Regards,

Kingsley



Thank you again for all your efforts. I am looking forward to see how this new endpoint work, :)

Are you planning to update regularly the dataset?

All the best!
Larry

https://iccl.inf.tu-dresden.de/web/Larry_Gonzalez



On 11.01.23 21:51, Kingsley Idehen via Wikidata wrote:
All,

We are pleased to announce immediate availability of an new Virtuoso-hosted Wikidata instance based on the most recent datasets. This instance comprises 17 billion+ RDF triples.

Host Machine Info:

Item     Value

CPU



|2x Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz|

Cores



|24|

Memory



|378 GB|

SSD



|4x Crucial M4 SSD 500 GB|


Cloud related costs for a self-hosted variant, assuming:

  *

    dedicated machine for 1 year without upfront costs

  *

    128 GiB memory

  *

    16 cores or more

  *

    512GB SSD for the database

  *

    3T outgoing internet traffic (based on our DBpedia statistics)


vendor     machine type     memory     vCPUs     monthly machine     monthly disk monthly network     monthly total

Amazon



r5a.4xlarge



128 GiB



16



$479.61



$55.96



$276.48



$812.05

Google



e2highmem-16



128 GiB



16



$594.55



$95.74



$255.00



$945.30

Azure



D32a



128 GiB



32



$769.16



$38.40



$252.30



$1,060.06


SPARQL Query and Full Text Search service endpoints:

  *

    https://wikidata.demo.openlinksw.com/sparql -- SPARQL Query Services
    Endpoint

  *

    https://wikidata.demo.openlinksw.com/fct -- Faceted Search & Browsing


Additional Information

  *

    Loading the Wikidata dataset 2022/12 into Virtuoso Open Source -
    Announcements - OpenLink Software Community (openlinksw.com)
<https://community.openlinksw.com/t/loading-the-wikidata-dataset-2022-12-into-virtuoso-open-source/3580>


Happy New Year!

-- 
Regards,

Kingsley Idehen
Founder & CEO
OpenLink Software
Home Page:http://www.openlinksw.com
Community Support:https://community.openlinksw.com
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Personal Weblogs (Blogs):
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Web Identities (WebID):
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