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Scaling Up Mixed Workloads: A Battle of Data Freshness, Flexibility, and Scheduling

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Exploiting Atomic Broadcast in Replicated Databases

Rachid Guerraoui, André Schiper, Fernando Pedone

Exploiting Atomic Broadcast in Replicated Databases F.Pedone, R.Guerraoui and A.Schiper Database replication protocols have historically been built on top of distributed database systems, and have consequently been designed and implemented using distribute ...

1998

On Spatial Database Integration

Stefano Spaccapietra, Christine Parent

This paper investigates the problems that arise when application requirements command that autonomous spatial databases be integrated into a federated one. The paper focuses on the most critical issues raised by the integration of databases of different sc ...

1998

Conceptual Modeling for Federated Geographical Information Systems over the Web

Stefano Spaccapietra, Christine Parent

A conceptual model provides the best support for federating heterogeneous datastores into a unified framework and elaborating a global consistent description of all available data. It therefore plays a central role for exchange of information within the co ...

1997

On Transaction Liveness in Replicated Databases

Rachid Guerraoui, Fernando Pedone

On Transaction Liveness in Replicated Databases F.Pedone and R.Guerraoui This paper makes a first attempt to give a precise characterisation of liveness in replicated database systems. We introduce the notion of liveness degrees, which express the expectat ...

1997

Transaction Reordering in Replicated Databases

Rachid Guerraoui, André Schiper, Fernando Pedone

Transaction Reordering in Replicated Databases F.Pedone, R.Guerraoui and A.Schiper This paper presents a fault-tolerant lazy replication protocol that ensures 1-copy serializability at a relatively low cost. Unlike eager replication approaches, our protoco ...

1997

Transaction Reordering in Replicated Databases

Rachid Guerraoui, André Schiper, Fernando Pedone

1997

Active Shape Models for Visual Speech Feature Extraction

Most approaches for lip modelling are based on heuristic constraints imposed by the user. We describe the use of Active Shape Models for extracting visual speech features for use by automatic speechreading systems, where the deformation of the lip model as ...

Springer Verlag1996

Transaction model vs Virtual Synchrony model: bridging the gap

Rachid Guerraoui, André Schiper

Two important models for building fault-tolerant applications have been independently proposed in the literature, the {\em transaction} model (developed within the context of database applications) and the {\em virtual synchrony} model (proposed initially ...

Springer-Verlag1995

MycDB: an integrated mycobacterial database

Stewart Cole

As part of ongoing efforts to investigate the molecular biology of the human pathogens in the genus Mycobacterium, a customized database was developed specifically for these organisms and implemented in ACEDB database manager software. The data loaded incl ...

1994

The Physics of an Ignited Tokamak

Francis Troyon

A next step device which can demonstrate long burn with a high probability of success is possible, without speculating on the accumulation of favorable effects and ignoring the other ones. From the data base available today this appears possible only with ...

1991