Hi Maria,
There is limited details on analysing Virtuoso Query Plan to spot obvious issue
at:
http://docs.openlinksw.com/virtuoso/databaseadmsrv.html#perfdiagqueryplans
<http://docs.openlinksw.com/virtuoso/databaseadmsrv.html#perfdiagqueryplans>
Is there a specific problem you are having or you are just seeking general
information on query plan analysis ?
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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> On 11 Mar 2015, at 12:51, Maria Jackson <maria.jackson....@gmail.com> wrote:
>
> Dear All,
>
> I ran the following explain SPARQL command. However, I am unable to
> understand the output of explain. Can someone please explain me the output?
> (I mean it is difficult to understand as to what is meant by RDF_QUAD_POGS
> 1 rows(s_1_4_t0.S, s_1_4_t0.O) and 0: c1 := Call __ro2sq (s_1_4_t0.O))
>
> SQL> explain('sparql select ?a?c1?c2 where{?a <http://dbpedia.org/b1
> <http://dbpedia.org/b1>> ?c1. ?a <http://dbpedia.org/b
> <http://dbpedia.org/b>> ?c2}');
> REPORT
> VARCHAR
> _______________________________________________________________________________
>
> {
> RDF_QUAD_POGS 1 rows(s_1_4_t0.S, s_1_4_t0.O)
> inlined P = #/b1
> RDF_QUAD_POGS 1 rows(s_1_4_t1.O)
> inlined P = #/b S = k_s_1_4_t0.S
>
> After code:
> 0: c1 := Call __ro2sq (s_1_4_t0.O)
> 5: a := Call __id2in (s_1_4_t0.S)
> 10: c2 := Call __ro2sq (s_1_4_t1.O)
> 15: BReturn 0
> Select (a, c1, c2)
> }
>
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by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
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