On 9/10/16 10:41 PM, giacom...@libero.it wrote: > So, I have a bunch of questions about Virtuoso. > > * Are SPARQL queries performed concurrently (using the standard virtuoso.ini > configuration)? Yes, Virtuoso is highly multi-threaded. In addition, it has vectorized query execution i.e., many query batches per thread, handled concurrently . > * Are Virtuoso transactions autocommittable, or there aren't any kind of > transactions when connecting to the ODBC driver?
Depends, by default you have Read Committed Isolation level. > * Does Virtuoso automatically performs triple indexing before query data? No, it has indexes in place. > In > some systems I have to configure it manually. > * 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? No, if anything that's faster than HTTP. Links: [1] http://docs.openlinksw.com/virtuoso/isolation/ [2] http://wikis.openlinksw.com/VirtuosoWikiWeb/ChangeVirtuosoSDefaultTransactionIsolationLevel [3] http://docs.openlinksw.com/virtuoso/fn_log_enable.html [4] http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning [5] http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtBulkRDFLoader#Running multiple Loaders Kingsley > > Thanks in advance for any support, >> JackB > ------------------------------------------------------------------------------ > _______________________________________________ > Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users > -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Medium Blog: https://medium.com/@kidehen Blogspot Blog: http://kidehen.blogspot.com Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen Personal WebID: http://kingsley.idehen.net/dataspace/person/kidehen#this
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