Projeto de dados em bancos de dados distribuídos

This work studies the problem of designing the data distribution for distributed databases from the coceptual level, using the well-known semantic model EntityRelationship. In the literature, data distribution desing is made at the logic level, wich makes the associated model at the conceptual level obsolete once the distribution schema is generated. Fragmentation is the usual process of distributing data, and it is applied only at the logic level. Therefore the database schema at the conceptual level is left out of date. By bringing the fragmentation process to the comceptual level our work intends to make the conceptual level as living entity throughout the design process abd also during the database life-time. Also, our method clarifies the structural nature of the fragmentation process, a fact that remained hidden in the logic level.