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• W49867678 abstract "Transaction management encompasses a broad range of research fields. File systems, cache consistency problems, performance evaluation, I/O systems or parallel computation, to mention a few, are common issues in the design of a transaction manager. Such a variety of topics makes it very difficult to be comprehensive. This same diversity makes it almost impossible to limit the research in the area to a unique aspect of transaction processing, especially when dealing with advanced (non-traditional) applications. Hence the format of this dissertation. Part of the research leading towards this work has been centered around two subjects, and the dissertation is therefore divided in parts that address these different topics. The first part focuses on the relation between the correctness criteria defined to control transaction interactions and the mechanisms used to recover from failures. The second part deals with the extension of a traditional transaction management to support modeling in scientific databases. Both problems have in common that the starting point is the traditional interpretation and implementation of a transaction manager that is later modified to cope with the demands of a non-traditional application, in the first case to support a larger class of correct schedules, and in the second to implement an entire new application of databases.The first part of the dissertation is more formal in the sense of dealing with a known problem of transaction managers. The two main tasks of a transaction manager are to ensure that transaction interleaving does not produce any incorrect result and to restore the database to a consistent state when failures occur. The first task is usually known as concurrency control. The second is referred to as recovery. These two are considered as orthogonal problems. This first part of the dissertation discusses the restrictions imposed by the recovery mechanisms on the concurrency control protocol and proposes a new implementation that eliminates such restrictions.The second part of the dissertation addresses the application of databases in scientific research. In particular, how to provide support for the modeling activities characteristics of these environments. The approach is to examine the execution of transactions as a way to determine the flow of information among the different datasets stored in the database. By carefully tracking the relations and interactions among transactions it is possible to establish a map of the relations and dependencies among datasets, a key step in the modeling process. These ideas have been implemented in a prototype, GOOSE (Geographic Object Oriented Support Environment), which is described in detail in this last part of the dissertation." @default.
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• W49867678 date "1995-09-01" @default.
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• W49867678 title "Managing advanced databases: concurrency, recovery, and cooperation in scientific applications" @default.
• W49867678 hasPublicationYear "1995" @default.
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