Semantics of Time-Varying Information

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Semantics of Time-Varying Information (1996)

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by Christian S. Jensen , Richard T. Snodgrass

Venue:	INFORMATION SYSTEMS
Citations:	37 - 18 self

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@ARTICLE{Jensen96semanticsof,
    author = {Christian S. Jensen and Richard T. Snodgrass},
    title = {Semantics of Time-Varying Information},
    journal = {INFORMATION SYSTEMS},
    year = {1996},
    volume = {21},
    pages = {311--352}
}

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Abstract

This paper provides a systematic and comprehensive study of the underlying semantics of temporal databases, summarizing the results of an intensive collaboration between the two authors over the last five years. We first examine how facts may be associated with time, most prominently with one or more dimensions of valid time and transaction time. One common case is that of a bitemporal relation, in which facts are associated with exactly one valid time and one transaction time. These two times may be related in various ways, yielding temporal specialization. Multiple transaction times arise when a fact is stored in one database, then later replicated or transferred to another database. By retaining the transaction times, termed temporal generalization, the original relation can be effectively queried by referencing only the final relation. We attempt to capture the essence of time-varying information via a very simple data model, the bitemporal conceptual data model. Emphasis is placed...

Keyphrases

time-varying information transaction time valid time bitemporal conceptual data model temporal specialization bitemporal relation common case intensive collaboration comprehensive study final relation various way temporal generalization original relation multiple transaction time temporal database simple data model

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