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VLDB
1987
ACM

Providing Time-Related Constraints for Conventional Database Systems

9 years 1 months ago
Providing Time-Related Constraints for Conventional Database Systems
A model for a historical database is described which is based upon time-stamped tuples as the unit of storage. The model includes both physical and logical time-stamps. The technical characteristics of write-once laser discs prevent the use of double logical time-stamps. The model distinguishes version from correction-updates. It is shown that if setvalued attributes are involved the use of null values is unavoidable if back-dated correction-updates are allowed. A method of handling user-defined integrity constraint rules is outlined which involves the maintenance of a time-stamped trace of such rules. Such a trace is necessary for the proper handling of back-dated correction-updates. An outline of a system SIS-BASE is described which implements someof these ideas.
T. Abbod, K. Brown, H. Noble
Added 28 Aug 2010
Updated 28 Aug 2010
Type Conference
Year 1987
Where VLDB
Authors T. Abbod, K. Brown, H. Noble
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