Importance

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Abstract

A database event detection and notification system includes a rule definer for defining a high level rule which can include conceptual terms (e.g. bad, heavy) and as cooperative operators (e.g. approximate, similar-to, near-to). A rule converter converts the high level rule into a low level rule in which the conceptual terms and cooperative operators are quantified. An event manager detects and evaluates an event generated by the database or a Local Event Detector (LED). A rule manager applies the low level rule to the event detected by the event manager, and an action manager performs an action in accordance with the application of the rule by the rule manager. The action can include notifying a specified person or program that the event has occurred. The rule converter and the action manager utilize a Type Abstraction Hierarchy (TAH) for converting the high level rule into the low level rule and performing the action respectively. The rule comprises an attribute. The TAH comprises leaves corresponding to instances of the attribute, and a hierarchical arrangement of nodes which specify ranges that include at least one of the instances respectively. The rule converter and the action manager are configured to convert the high level rule into the low level rule and perform the action by relaxing a value of the attribute in accordance with the TAH. An existing rule can be modified or a new rule inserted into the system without shutting down the system and recompiling all the rules.

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First Claim