Original language | English |
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Pages (from-to) | 368-382 |
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Number of pages | 15 |
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Journal | ACM Transactions on Database Systems |
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Volume | 4 |
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Issue number | 3 |
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DOIs | |
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Publication status | Published - 1979 |
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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.
ID: 10625104