Efficiently monitoring relational databases

  • Authors:
  • O. Peter Buneman;Eric K. Clemons

  • Affiliations:
  • Univ. of Pennsylvania, Philadelphia;Univ. of Pennsylvania, Philadelphia

  • Venue:
  • ACM Transactions on Database Systems (TODS)
  • Year:
  • 1979

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Abstract

An alerter is a program which monitors a database and reports to some user or program when a specified condition occurs. It may be that the condition is a complicated expression involving several entities in the database; in this case the evaluation of the expression may be computationally expensive. A scheme is presented in which alerters may be placed on a complex query involving a relational database, and a method is demonstrated for reducing the amount of computation involved in checking whether an alerter should be triggered.