[Virtuoso-users] Optimizing query (indices?)

[Sebastian Trüg]

Hello list,

the following query is rather slow on my Virtuoso 5.0.12 with 603.323 triples:

select ?date where { ?r a nfo:FileDataObject . ?r nie:lastModified ?date . }
      ORDER BY ?date LIMIT 1

How can I optimize such queries? Do I need to define a specific index?

Thanks,
Sebastian Trueg