System for merging virtual partitions of a distributed database

Details System for merging virtual partitions of a distributed database System for merging virtual partitions of a distributed database

1987-12-18

1989-08-01

Chan, Eddie P.

Boots, shoes, and leggings

3642821, 3642824, 364300, G06F 1520

Patent

active

048538434

ABSTRACT:
An object-oriented, distributed data base system separates into a plurality of virtual partitions following communication failure between sites accessing the data base. Each partition accesses a separate copy of an initial data base and independently updates groups of data objects included in the data base to add new versions of data objects to the data base. Each virtual partition maintains a copy of all previous versions of data objects and maintains a change list describing all group updates that it executes. Following restoration of communication between sites, each virtual partition merges the data bases maintained by separate partitions to form a consistent merged data base permitting versions of data objects and collections of data objects created by any one of the separate virtual partitions to be identified and accessed in the merged data base.

REFERENCES:
patent: 4432057 (1984-02-01), Daniell et al.
patent: 4511964 (1985-04-01), Georg et al.
patent: 4558413 (1985-12-01), Schmidt et al.
patent: 4635189 (1987-01-01), Kendall
patent: 4648036 (1987-03-01), Gallant
patent: 4686620 (1987-08-01), Ng
patent: 4769772 (1988-09-01), Dwyer
"Robustness in Distributed Hypothetical Databases" by D. Ecklund, published 1985 in Proceedings of the Nineteenth Hawaii International Conference on System Sciences.

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