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Continuous Query Function to Monitor Changes to a Database

IP.com Disclosure Number: IPCOM000039607D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Bui, TQ Freeman, HL Munroe, SJ Pelnar, EH Roediger, RR Shi, SR Tiemens, TW [+details]

Abstract

A continuous query is used to monitor future activities which affect target records. Processes need not continually query the record for changes because the system query function will detect and inform the processes of the changes. Bit maps are used to identify the target records and specify the returned fields. A bit map is a sequence of bits where each bit is associated with a field in the database entry. A bit setting of '1'b is used to show the presence of the associated field in a data string. Therefore, the order of the data in the data string must be the same as the order of the selected bits ('1'b) in the bit map. A "continuous" query request is sent to a database manager. This request includes two "bit map" fields and a data string.