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A database snapshot mechanism rcprcsents a cost effectivc substitute for replicated data in a distributed database. The contents of a database snapshot can be periodically refreshed to reflect the current state of the database. In a distributed database system it is sign& icant to reduce the cost of snapshot refresh. This can be obtained by a differential(More)
This paper presents a log-based algorithm for recovering the state of database application programs after system crashes. AIthough the general idea of the algorithm is quite simple, the interaction between the program, the user, and the database management system has to be investigated with care. To describe the details of the algorithm clearly, we(More)
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