The number of datasets published in the Web of Data as part of the
Linked Data Cloud is constantly increasing. The Linked Data paradigm is
based on the unconstrained publication of information by different
publishers, and the interlinking of web resources through “same-as”
links which specify that two URIs correspond to the same real world
object. In the vast number of data sources participating in the Linked
Data Cloud, this information is not …

In this post we will look at running the LDBC SNB on Virtuoso.

First, let’s recap what the benchmark is about:

  1. fairly frequent short updates, with no update contention worth
  2. short random lookups
  3. medium complex queries centered around a person’s social environment

The updates exist so as to invalidate strategies that rely too heavily
on precomputation. The short lookups exist for the sake of realism;
after all, an online …

SNB and Graphs Related Presentations at GRADES '15


Next 31st of May the GRADES workshop will take place in Melbourne within the ACM/SIGMOD presentation. GRADES started as an initiative of the Linked Data Benchmark Council in the SIGMOD/PODS 2013 held in New York.

Among the papers published in this edition we have “Graphalytics: A Big Data Benchmark for Graph-Processing Platforms”, which presents a new benchmark that uses the Social Network Benchmark data generator of LDBC (that can …

SNB Interactive Part 2: Modeling Choices


​SNB Interactive is the wild
frontier, with very few rules. This is necessary, among other reasons,
because there is no standard property graph data model, and because the
contestants support a broad mix of programming models, ranging from
in-process APIs to declarative query.

In the case of Virtuoso, we have played with SQL and SPARQL implementations. For a fixed schema and well known workload, SQL will always win. The reason for this is that …

LDBC Participates in the 36th Edition of the ACM SIGMOD/PODS Conference


LDBC is presenting two papers at the next edition of the ACM SIGMOD/PODS
conference held in Melbourne from May 31st to June 4th, 2015. The annual
ACM SIGMOD/PODS conference is a leading international forum for database
researchers, practitioners, developers, and users to explore
cutting-edge ideas and results, and to exchange techniques, tools and

On the industry track, LDBC will be presenting the Social Network
Benchmark Interactive …

This post is the first in a series of blogs analyzing the LDBC Social
Network Benchmark Interactive workload. This is written from the dual
perspective of participating in the benchmark design and of building the
OpenLink Virtuoso implementation of same.

With two implementations of SNB interactive at four different scales, we
can take a first look at what the benchmark is really about. The
hallmark of a benchmark implementation is that its …