Valid time: Difference between revisions
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'''Valid time''' (VT), a concept originated by [[Richard T. Snodgrass]] and his doctoral student, is used in [[temporal database]]s.<ref> Richard T. Snodgrass and Ilsoo Ahn, "Temporal Databases," IEEE Computer 19(9), September, 1986, pp. 35–42.</ref> It denotes the time period during which a database fact was, is, or will be valid in the modeled reality. |
'''Valid time''' (VT), a concept originated by [[Richard T. Snodgrass]] and his doctoral student, is used in [[temporal database]]s. |
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<ref> Richard T. Snodgrass and Ilsoo Ahn, "Temporal Databases," IEEE Computer 19(9), September, 1986, pp. 35–42.</ref> It denotes the time period during which a database fact was, is, or will be valid in the modeled reality. |
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In a database table valid time is often represented by two extra table-columns ''StartVT'' and ''EndVT''. The time interval is closed at its [[lower bound]] and open at its [[upper bound]]. |
In a database table valid time is often represented by two extra table-columns ''StartVT'' and ''EndVT''. The time interval is closed at its [[lower bound]] and open at its [[upper bound]]. |
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Revision as of 00:02, 29 April 2010
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Valid time (VT), a concept originated by Richard T. Snodgrass and his doctoral student, is used in temporal databases. [1] It denotes the time period during which a database fact was, is, or will be valid in the modeled reality.
In a database table valid time is often represented by two extra table-columns StartVT and EndVT. The time interval is closed at its lower bound and open at its upper bound.
See also
References
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valid time and transaction time are two different apspects in designing a database
- ^ Richard T. Snodgrass and Ilsoo Ahn, "Temporal Databases," IEEE Computer 19(9), September, 1986, pp. 35–42.