Hi, > On 11 Sep 2016, at 03:41, giacom...@libero.it wrote: > > So, I have a bunch of questions about Virtuoso. > > * Are SPARQL queries performed concurrently (using the standard virtuoso.ini > configuration)?
[Hugh] Yes, although you shoud tune your Virtuoso server for the machine type
it is running on as detailed in the performance tuning guide:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning
<http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning>
> * Are Virtuoso transactions autocommittable, or there aren't any kind of
> transactions when connecting to the ODBC driver?
[Hugh] Yes, Virtuoso support all database transaction isolation which can also
be applied in SPARQL/RDF much as with SQL:
http://docs.openlinksw.com/virtuoso/ptune.html
<http://docs.openlinksw.com/virtuoso/ptune.html>
> * Does Virtuoso automatically performs triple indexing before query data? In
> some systems I have to configure it manually.
[Hugh] A default set of indexes are create for the RDF Quad Store when the
database is created as indicated in the performance tuning guides and data
loaded is automatically Indexed, thus nothing to manually create …
> * Does the usage of ODBC degradates the benchmarking of Virtuoso's SPARQL
> query or the time required to store the triples within a given named graph?
[Hugh] No, there will be no performance degradation performed SPARQL operation
via ODBC or any other SQL ( ie JDBC, ADO.Net etc ) interface.
Best Regards
Hugh Williams
OpenLink Software
>
> Thanks in advance for any support,
>> JackB
>
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