Encyclopedia of Database Systems

Living Edition
| Editors: Ling Liu, M. Tamer Özsu

Composite Event

  • AnnMarie Ericsson
  • Mikael Berndtsson
  • Jonas Mellin
Living reference work entry
DOI: https://doi.org/10.1007/978-1-4899-7993-3_514-2

Definition

A composite event is a set of events matching an event specification.

Key Points

Pioneering work on composite events was done in the HiPAC project [1], and the ideas were extended and refined in most proposals for active object-oriented databases during the early 1990s.

A composite event is composed according to an event specification (in an event algebra), where the composition is performed using a set of event operators such as disjunction, conjunction, and sequence. More advanced event operators have been suggested in literature, e.g., [2, 3, 4].

The initiator of a composite event is the event initiating the composite event occurrence, and the terminator is the event terminating the composite event occurrence.

Events contributing to composite events may carry parameters (e.g., temporal) in which the event is said to occur. Events contributing to composite events are also referred to as constituent events.

Composite events need to be composed according to some event...

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Recommended Reading

  1. 1.
    Dayal U, Blaustein B, Buchmann A, Chakravarthyand S, et al. HiPAC: a research project in active, time-constrained database management. Technical report CCA-88-02. Xerox Advanced Information Technology, Cambridge. 1988.Google Scholar
  2. 2.
    Chakravarthy S, Mishra D. Snoop: an expressive event specification language for active databases. Data Knowl Eng. 1994;14(1):1–26.CrossRefGoogle Scholar
  3. 3.
    Gatziu S. Events in an active object-oriented database system. PhD thesis, University of Zurich, Switzerland. 1994.Google Scholar
  4. 4.
    Gehani N, Jagadish HV, Smueli O. Event specification in an active object-oriented database. In: Proceedings of ACM SIGMOD International Conference on Management of Data; 1992. p. 81–90.Google Scholar
  5. 5.
    Chakravarthy S, Krishnaprasad V, Anwar E, Kim SK. Composite events for active databases: semantics contexts and detection. In: Proceedings of 20th International Conference on Very Large Data Bases; 1994. p. 606–17.Google Scholar

Copyright information

© Springer Science+Business Media LLC 2017

Authors and Affiliations

  • AnnMarie Ericsson
    • 1
  • Mikael Berndtsson
    • 1
  • Jonas Mellin
    • 1
  1. 1.University of SkövdeSkövdeSweden