Re: [Bigdata-developers] Explain not working

[Bryan T. <br...@sy...>]

Rose,

Those are URL query parameters.  They are appended onto the end of the
SPARQL endpoint URL.

http://.../sparql?explain

If there are multiple URL query parameters then the next one is introduced
with an ampersand &.  If there is a value associated with a parameter then
it is ?foo=bar or &foo=bar.  This is standard http.

The explain gives the time to run the query but not the time to send the
results to the client.  The client (the workbench) is probably reporting
the total time until the query results are fully materialized on the client.

The explain output is explained on the performance optimization pages on
the wiki.

Thanks,
Bryan

On Thursday, November 13, 2014, Rose Beck <ros...@gm...> wrote:

> As stated at http://wiki.bigdata.com/wiki/index.php/NanoSparqlServer
> one can pass "explain" as a parameter to SPARQL query passed in CURL.
>
> curl -X POST http://localhost:8080/bigdata/sparql --data-urlencode
> 'query=SELECT * { ?s ?p ?o } LIMIT 1' -H 'Accept:application/rdf+xml'
>
> However, if I use the following (which works perfectly) well for
> Virtuoso, I get an error:
> curl -X POST http://localhost:8080/bigdata/sparql --data-urlencode
> 'query=explain 'SELECT * { ?s ?p ?o } LIMIT 1'' -H
> 'Accept:application/rdf+xml'
>
> Also "explain" on Bigdata workbench when executed in a browser gives
> elapsed time of the time given below:
> solutions=2, chunks=1, subqueries=0, elapsed=32ms.
>
> Is the elapsed time same as the query execution time -- if not then
> what is the difference? Because on the browser bigdata reports
> different elapsed time as well as query execution time.
>
>
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-- 
----
Bryan Thompson
Chief Scientist & Founder
SYSTAP, LLC
4501 Tower Road
Greensboro, NC 27410
br...@sy...
http://bigdata.com
http://mapgraph.io

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