Vasilis Spyropoulos

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In this paper we present Digree, an experimental middleware system that can execute graph pattern matching queries over databases hosting voluminous graph datasets. First, we formally present the employed data model and the processes of re-writing a query into an equivalent set of subqueries and subsequently combining the partial results into the final(More)
Many modern applications naturally lead to the implementation of inverted indexes for effectively managing large collections of data items. Creating an inverted index on a low cardinality data domain results in replication of data descriptors, leading to increased storage overhead. For example, the use of RFID or similar sensing devices in supply-chains(More)
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