SESAMO : um controlador de concorrência que implementa a serialidade semântica de forma descentralizada em sistemas de bancos de dados múltiplos com suporte a mobilidade

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In a mobile multidatabase system, there is a collection of autonomous, distributed, heterogeneous and mobile component database systems which are interconnected by means of a wireless network. In such an environment, each network node can access multiple databases of that collection by means of global transactions whose concurrency is managed by a scheduler, which should be preferably distributed. Several distributed schedulers proposed for mobile multidatabase systems do violate either the consistency or the autonomy of the component database systems, due either to the relaxation or the enforcement, respectively, of the Serializability as the criterion for controlling the concurrency of global transactions. This paper proposes SESAMO, which is a distributed scheduler for mobile MDBSs. SESAMO is based on the finding that a mobile MDBS, in which the concurrency control is performed by the simultaneous execution of multiple autonomous schedulers implementing the Semantic Serializability correctness criterion, does preserve the autonomy and the data consistency of the component database systems. As could be evidenced in experimental results, SESAMO may provide a high degree of concurrency.

ASSUNTO(S)

sistemas de informacao sistema de comunicaÇÃo mÓvel - dissertaÇÕes banco de dados - dissertaÇÕes

ACESSO AO ARTIGO

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