yes it's improving (i added some grpah meanwhile so 46 rows is the
correct number) :
SPARQL SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } };
46 Rows. -- 1337 msec.
DB.DBA.SPARQL_SELECT_KNOWN_GRAPHS();
46 Rows. -- 434 msec.
I had already VectorSize = 1000 in virtuoso.ini but I had
AdjustVectorSize = 1 so changing to 0 has an effect
We have 232 973 825, read only use case mainly, is it ok to keep
AdjustVectorSize = 0 has documentation says it will be better to
improve performance with = 1 ?
Thanks,
Thomas
Le 05/04/2016 12:52, Hugh Williams a écrit :
> Hi Thomas,
>
> Can you please set the following INI file params in the “[Parameters]”
> section, restart Virtuoso and rerun the queries to see if the response time
> for the second query and DB.DBA.SPARQL_SELECT_KNOWN_GRAPHS() improves :
>
> VectorSize = 1000
> AdjustVectorSize = 0
>
>
> Best Regards
> Hugh Williams
> Professional Services
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>
>
>
>> On 5 Apr 2016, at 10:24, Thomas Michaux <mich...@abes.fr> wrote:
>>
>> Hello,
>>
>> I found strange that V7.2.2 is faster to answer :
>>
>>
>> SQL> sparql SELECT ?g COUNT(*) AS ?c { GRAPH ?g {?s ?p ?o.} } GROUP BY ?g
>> ORDER BY DESC(?c);
>> 37 Rows. -- 2447 msec.
>> (use all 8 cores and CPU up to 800%)
>>
>>
>> than
>>
>>
>> SPARQL SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } };
>> 37 Rows. -- 522493 msec.
>> (seem to use only 1 core and CPU up to 100%)
>>
>> any idea why not should use the first query in the Conductor "graph" tab
>> (DB.DBA.SPARQL_SELECT_KNOWN_GRAPHS) to list the graphs ??
>>
>> Thanks,
>>
>> Thomas
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