http://docs.openlinksw.com/virtuoso/rdfdatarepresentation.html states that:
Virtuoso supports a native IRI_ID data type, internally an unsigned 32 bit or unsigned 64 bit integer value. Small databases can use 32 bit values but if database becomes big then the administrator should executeDB.DBA.RDF_64BIT_UPGRADE() procedure that will switch to 64-bit values. I've loaded 2 million subjects - accordingly it makes sense that I'd need 64-bit hashes. When I try to call DB.DBA.RDF_64BIT_UPGRADE(), I get an error that it is not defined. It occurs to me that: 1. This may be a feature of Virtuoso Professional 2. OpenLink Sw. may be using 64-bit hashes all the time (more sensible in my view). And then there may also be a problem with my installation, e.g. some configure option for same. I haven't observed any collisions, I'm just digging in and have a concern. Dan Davis, Systems/Applications Architect (Contractor), Office of Computer and Communications Systems, National Library of Medicine, NIH
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