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Re: The truth about SPARQL Endpoint availability

From: Andrea Splendiani <andrea.splendiani@bbsrc.ac.uk>
Date: Sat, 5 Mar 2011 13:06:27 +0000
Cc: "public-lod@w3.org" <public-lod@w3.org>, SW-forum <semantic-web@w3.org>, "semanticweb@yahoogroups.com" <semanticweb@yahoogroups.com>
Message-Id: <FA04F59D-9CC7-4011-AAB8-7B7A974D5FF4@bbsrc.ac.uk>
To: Pierre-Yves Vandenbussche <py.vandenbussche@gmail.com>
Hi, very nice!
I have a small suggestion:

why don't you ask "count(*) where {?s ?p ?o}" to the endpoint ?
Or ask for the number of graphs ?
Both information, number of triples and number of graphs, if logged and compared over time, can give a practical view of the liveliness of the content of the endpoint.

Andrea Splendiani

Il giorno 28/feb/2011, alle ore 18.55, Pierre-Yves Vandenbussche ha scritto:

> Hello all,
> you have already encountered problems of SPARQL endpoint accessibility ?
> you feel frustrated they are never available when you need them?
> you develop an application using these services but wonder if it is reliable?
> Here is a tool [1] that allows you to know public SPARQL endpoints availability and monitor them in the last hours/days. 
> Stay informed of a particular (or all) endpoint status changes through RSS feeds.
> All availability information generated by this tool is accessible through a SPARQL endpoint.
> This tool fetches public SPARQL endpoints from CKAN  open data. From this list, it runs tests every hour for availability.
> [1] http://labs.mondeca.com/sparqlEndpointsStatus/index.html
> [2] http://ckan.net/
> Pierre-Yves Vandenbussche.

Andrea Splendiani
Senior Bioinformatics Scientist
Centre for Mathematical and Computational Biology
+44(0)1582 763133 ext 2004
Received on Saturday, 5 March 2011 13:10:24 UTC

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