Software Prototypes

APPA (Atlas Peer-to-Peer Architecture)

URL : http://www.sciences.univ-nantes.fr/lina/gdd/appa/

APPA is a new P2P data management system that provides scalability, availability and performance for applications which deal with semantically rich data (XML, relational, etc.). APPA provides advanced services such as queries, replication and load balancing. It is being implemented on top of the Open Source JXTA framework and tested on GRID5000.

RepDB*.

RepDB* is a data management component for replicating autonomous databases or data sources in a cluster system. It has been initially designed in the context of the Leg@net RNTL project and furthere developped in the context of the ACI MDP2P project. RepDB* supports preventive data replication capabilities (multi-master modes, partial replication, strong consistency) which are independent of the underlying DBMS. It uses general, non intrusive techniques. It is implemented in Java on Linux and supports various DBMS: Oracle™, PostGreSQL and BerkeleyDB. It has been validated on the Atlas 8-node cluster and another 64-node cluster at INRIA-Rennes. In 2004, we registered RepDB* (together with the University of Nantes) to the APP (Agence pour la Protection des Programmes) and released it as Open Source Software under the GPL licence.

SaintEtiQ

SaintEtiQ is a data summarisation system providing synthetic user-friendly views over large databases. The fuzzy-set based representation of summaries provides an effective way of dealing with uncertainty in data, and natively supports flexible queries. A user-centric approach of a summary-oriented knowledge discovery process has been integrated into the prototype. We also enhanced the implementation with a set of tools to generate the background knowledge required for the summarisation process. Finally, a complete graphical user interface has been developed to support the user manipulating and browsing data, background knowledges and summaries.