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Practical database replication
Correia Júnior, Alfrânio TavaresTese de doutoramento em Informática ; Software-based replication is a cost-effective approach for fault-tolerance when combined with commodity hardware. In particular, shared-nothing database clusters built upon commodity machines and synchronized through eager software-based replication protocols have been driven by the distributed systems community in the last decade. The efforts on eager database replicatio...
A pragmatic protocol for database replication in interconnected clusters
Pereira, José, 1973-; Oliveira, Rui Carlos Mendes de; Grov, J.; Soares, L.; Correia Júnior, Alfrânio Tavares; Pedone, F.Multi-master update everywhere database replication, as achieved by protocols based on group communication such as DBSM and Postgres-R, addresses both performance and availability. By scaling it to wide area networks, one could save costly bandwidth and avoid large round-trips to a distant master server. Also, by ensuring that updates are safely stored at a remote site within transaction boundaries, disaster re...
Evaluating certification protocols in the partial database state machine
Sousa, António Luís Pinto Ferreira de; Moura, Francisco Coelho Soares; Pereira, José, 1973-; Oliveira, Rui Carlos Mendes dePartial replication is an alluring technique to ensure the reliability of very large and geographically distributed databases while, at the same time, offering good performance. By correctly exploiting access locality most transactions become confined to a small subset of the database replicas thus reducing processing, storage access and communication overhead associated with replication. The advantages of part...
Testing the dependability and performance of group communication based database...
Sousa, António Luís Pinto Ferreira de; Pereira, José, 1973-; Soares, L.; Correia Júnior, Alfrânio Tavares; Rocha, L.; Oliveira, Rui Carlos Mendes deDatabase replication based on group communication systems has recently been proposed as an efficient and resilient solution for large-scale data management. However, its evaluation has been conducted either on simplistic simulation models, which fail to assess concrete implementations, or on complete system implementations which are costly to test with realistic large-scale scenarios. This paper presents a tool...
Group-based replication of on-line transaction processing servers
Correia Júnior, Alfrânio Tavares; Sousa, António Luís Pinto Ferreira de; Soares, L.; Pereira, José, 1973-; Moura, Francisco Coelho SoaresSeveral techniques for database replication using group communication have recently been proposed, namely, the Database State Machine, Postgres-R, and the NODO protocol. Although all rely on a totally ordered multicast for consistency, they differ substantially on how multicast is used. This results in different performance trade-offs which are hard to compare as each protocol is presented using a different loa...
Distributed transaction processing in the Escada protocol
Correia Júnior, Alfrânio TavaresReplicação é uma técnica essencial para a implementação de bases de dados tolerantes a faltas, sendo também frequentemente utilizada para melhorar o seu desempenho. Infelizmente, quando critérios de consistência forte e a capacidade de actualização a partir de qualquer réplica são consideradas, os protocolos de replicação actualmente disponíveis nos gestores de bases de dados comerciais não apresentam um bom de...
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