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Author Vianu, Victor
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©1987
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract A simple extension of the relational model is introduced to study the effects of dynamic constraints on database evolution. Both static and dynamic constraints are used in conjunction with the model. The static constraints considered here are functional dependencies (FDs). The dynamic constraints involve global updates and are restricted to certain analogs of FDs, called “dynamic” FDs. The results concern the effect of the dynamic constraints on the static constraints satisfied by the database in the course of time. The effect of the past history of the database on the static constraints is investigated using the notions of age and age closure. The connection between the static constraints and the potential future evolution of the database is briefly discussed using the notions of survivability and survivability closure.
ISSN 00045411
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1987-01-01
Publisher Place New York
e-ISSN 1557735X
Journal Journal of the ACM (JACM)
Volume Number 34
Issue Number 1
Page Count 32
Starting Page 28
Ending Page 59


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Source: ACM Digital Library