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