Data server with data probes employing predicate tests in rule s

Details Data server with data probes employing predicate tests in rule s Data server with data probes employing predicate tests in rule s

1994-06-23

1997-03-25

Black, Thomas G.

Boots, shoes, and leggings

395 50, 395 66, 39520003, 364DIG1, 364DIG2, G06F 1730

Patent

active

056153597

ABSTRACT:
A data server data base system is enhanced by the inclusion of Event processing in which the occurrence of an event based on a predicate test is determined by the data server without requiring attention of the user application. In particular, the user application stores a rule statement in the data server and then references that statement by name in a data inquiry. An event level data probe is invoked to collect the data referenced in the rule statement and the collected data is tested in accordance with the rule statement to determine if the event has occurred. Data passing the rule statement test is returned to the user application if the event is determined to have occurred unless Delta processing is invoked in which case only data representing a transition from Event true to Event false or Event false to Event true is returned.

REFERENCES:
patent: 5109486 (1992-04-01), Seymour
patent: 5129081 (1992-07-01), Kobayashi et al.
patent: 5307484 (1991-03-01), Baker et al.
patent: 5446885 (1992-05-01), Moore et al.
"Using Stored Procedures and Triggers", by Herb Edelstein, DBMS, v5, n10, p. 66(5) Sep. 1992.
IBM Technical Disclosure Bulletin, "Method to Centralize Maintenance Activity of a Performance Database," vol. 35, No. 2, Jul. 1992, pp. 364-368.
Snodgrass, Richard, ACM Transactions on Computer Systems, vol. 6, No. 2, "A Relational Approach to Monitoring Complex Systems," May 2, 1988, New York, NY, pp. 157-196.

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