- Virtuoso has proven quite useful. I don't want to advertise here, but the thing they have going for DBpedia uses ridiculous hardware, i.e. 64GB RAM and it is also the OS version, not the professional with clustering and repartition capability. So we are playing the game since ten years now: Everybody tries other databases, but then most people come back to virtuoso. I have to admit that OpenLink is maintaining the hosting for DBpedia themselves, so they know how to optimise. They normally do large banks as customers with millions of write transactions per hour. In LOD2 they also implemented column store features with MonetDB and repartitioning in clusters.

I'm not entirely sure how to read the above (and a quick look at
virtuoso website does not give me the answer either), but it looks
like the sharding / partitioning options are only available in the
enterprise version. That probably makes it a non starter for us.

Virtuoso Cluster Edition is as described by Sebastian in an earlier post to this thread [1]. Online that's behind our LOD Cloud cache which hosts 40 Billion+ triples, but still using ridiculously cheap hard-ware for the share-nothing cluster.

As Jerven has already articulated [2], the single-server open source edition of Virtuoso can also scale to 40 Billion+ triples as demonstrated by Uniprot amongst others.

There's a publicly available Google Spreadsheet that provides insights into a variety of Virtuoso configurations that you can also look at regarding resource requirements [3].

Bottom line, Virtuoso has no fundamental issues with performance, scale, or security (most haven't hit this bump yet, but its coming!) regarding RDF-data deployed in line with Linked Data principles.

We are always opened to collaboration with anyone (or group) seeking to fully exploit the power and promise of a Semantic Web derived from Linked Data :)

Links:

[1] https://lists.wikimedia.org/pipermail/wikidata/2019-June/013132.html -- Sebastian Hellman comment

[2] https://lists.wikimedia.org/pipermail/wikidata/2019-June/013143.html -- Jerven Bolleman comment

[3] https://docs.google.com/spreadsheets/d/1-stlTC_WJmMU3xA_NxA1tSLHw6_sbpjff-5OITtrbFw/ -- Virtuoso configurations sample spreadsheet

[4] https://hub.docker.com/u/openlink/ -- Docker Hub offerings

[5] https://aws.amazon.com/marketplace/pp/B00ZWMSNOG -- Amazon Marketplace BYOL Edition

[6] https://aws.amazon.com/marketplace/pp/B011VMCZ8K -- Amazon Marketplace PAGO Edition

[7] https://github.com/openlink/virtuoso-opensource -- Github

[8] http://download.openlinksw.com -- Download Site

-- 
Regards,

Kingsley Idehen	      
Founder & CEO 
OpenLink Software   
Home Page: http://www.openlinksw.com
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