Hi All,
I have been working on upgrading myExperiment’s SPARQL endpoint to use
4Store (http://www.4store.org) from JENA. This should make it much
quicker at finding results than it has been in the past. I am
currently running a test instance of the 4Store-backed SPARQL endpoint
at http://rdf.myexperiment.org/sparql4. So if people want to try out
some of their more complex SPARQL queries to see if they run quicker
that would be most appreciated.
I have endeavoured to maintain all the previous functionality in as
similar way as possible but inevitably there are some differences:
- No JSON results format
- 4Store does not have a way of timing out queries that take too long.
They either return only partial results and/or send a warning message
about the complexity. Instead of a timeout option I have provided a
“Resource Usage” option. This is defaulted to 5% which is suitable for
most basic queries but if you get a warning saying that a query could
not return all results then increasing this percentage should help.
In theory the endpoint should be updated each morning much like the
current endpoint but I have only just sorted out the scripts to do
this and I wouldn’t want to guarantee their reliability at the moment.
Anyway, any comments/feedback would be most appreciated.
Regards
David Newman
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