gStore-C: A Transactional RDF Store with Light-Weight Optimistic Lock.

RDF systems are widely applied in many areas such as knowledge base, semantic web, social network. Traditional RDF systems focus on speed up SPARQL queries on large RDF data but disregarding the performance of updates and transaction processing. In this demonstration, we propose a new transactional RDF system based on multi-version and MVCC. We introduce a lightweight optimistic lock upon atomic variables and operations that provides fine-grained locking and avoids scalability issues. The methods are fully implemented in an open-source RDF system gStore. And it outperforms other state-of-art RDF systems solutions on transactional workloads.