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Temporal Specialization

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Encyclopedia of Database Systems

Synonyms

Temporal restriction

Definition

Temporal specialization denotes the restriction of the interrelationships between otherwise independent (implicit or explicit) timestamps in temporal relations. An example is a relation where tuples are always inserted after the facts they record were valid in reality. In such a relation, the transaction time of a tuple would always be after the valid time. Temporal specialization may be applied to relation schemas, relation instances, and individual tuples.

Key Points

Data models exist where relations are required to be specialized, and temporal specializations often constitute important semantics about temporal relations that may be utilized for, e.g., improving the efficiency of query processing.

Temporal specialization encompasses several kinds of specialization. One is based on the relationships between isolated events, and one based on inter-event relationships. Two additional kinds consider intervals instead of events, and one is based on...

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Recommended Reading

  1. Jensen C.S. and Dyreson C.E. (eds.). A consensus glossary of temporal database concepts – February 1998 version. In Temporal Databases: Research and Practice, O. Etzion, S. Jajodia, S. Sripada (eds.). LNCS 1399, Springer-Verlag, Berlin, 1998, pp. 367–405.

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  2. Jensen C.S. and Snodgrass R.T. Specialized temporal relations. In Proc. 8th Int. Conf. on Data Engineering, 1992, pp. 594–603.

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  3. Jensen C.S. and Snodgrass R.T. Temporal specialization and generalization. IEEE Trans. Knowl. Data Eng., 5(6):954–974, 1994.December

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Author information

Authors and Affiliations

  1. Aalborg University, Aalborg, Denmark

    Christian S. Jensen

  2. University of Arizona, Tucson, AZ, USA

    Richard T. Snodgrass

Authors
  1. Christian S. Jensen
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  2. Richard T. Snodgrass
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Jensen, C.S., Snodgrass, R.T. (2009). Temporal Specialization. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1058

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