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- W1570892543 abstract "The research in temporal databases has, so far, concentrated on the history of an object as it exists in the real world. Instead, in this paper we view the history of an object as it is recorded in a database. Such a history is obtained by extr (insert, modify, and Yr lating the outcome of the u$ttes elete) made to the object at drscrete instants. Our model su ports two kinds of query-users: the s stem-user, and the coszical-user. For the classical-user, E P t e interface to the database is identical to the usual interface in classical snapshot databases. We extend the classical relational model so that a transaction, i.e., an update or a (retrieval) query is recorded in such a way that its effect can be determine d at any time in the future; thus, our model is a zero information-loss model logical structure im P I Theorem 1). The oeed upon the mode allows us to give a powerful algebra or the system-user to query the circumstantial information surrounding updates and queries. In addition, a single execution of a query can be identified with the relation it retrieves; thus, a user can query queries, query queries on queries, ad infinitum. The model represents an application of temporal databases to mainstream databases. It can be used in auditing, and as a foundation for building secure systems." @default.
- W1570892543 created "2016-06-24" @default.
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- W1570892543 date "1989-07-01" @default.
- W1570892543 modified "2023-09-23" @default.
- W1570892543 title "Achieving zero information-loss in a classical database environment" @default.
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