I apologize for another mail, but I have a deadline tomorrow so I'll greatly appreciate if you could please help with this a little.
On Wed, Jul 27, 2016 at 9:45 PM, Maria Jackson <maria.jackson....@gmail.com> wrote: > I ran the following query on Virtuoso: > > [code]PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> > SELECT DISTINCT ?X > WHERE > {?X rdf:type Musician . > ?X rdf:plays <http://Music>} > [/code] > > The output of "explain" of this query is: > [code]{ > RDF_QUAD_POGS 4 rows(s_1_4_t1.S) > P = ##plays , O = #/Music > RDF_QUAD_POGS 0.8 rows(s_1_4_t0.S) > inlined P = ##type , O = ##Musician , S = s_1_4_t1.S > Distinct (s_1_4_t0.S) > > After code: > 0: X := := artm s_1_4_t0.S > 4: BReturn 0 > Subquery Select(X) > > After code: > 0: X := Call __ro2sq (X) > 5: BReturn 0 > Select (X) > } > [/code] > > Now I am unable to decipher the output of explain command. What do > "ro2sq", "inlined" and "artm" mean? And which join algorithm (like > Hash Join, Merge Join, Nested loop join, etc.) is Virtuoso using for > this query? I need to understand Virtuoso's explain command in order > to understand the reason for Virtuoso taking a long time to execute? ------------------------------------------------------------------------------ _______________________________________________ Virtuoso-users mailing list Virtuoso-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtuoso-users
