A system for relations recovery of a data base in case of...

Details A system for relations recovery of a data base in case of... A system for relations recovery of a data base in case of...

G - Physics

06

F

G06F 11/08 (2006.01) G06F 11/14 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2151255

A system for recovery of relations in a data base in case of errors, comprises functionnality executed by a computer and ensuring that data in the data base are structured as items of data in a number of recovery sub- systems, each item of data belonging to only one sub-system. If a sub-system contains one or more items of data that depend on one or more items of data in another sub-system, the first mentioned sub-system is marked as depending on a third sub-system. If a first sub-system is marked as depending on said second sub-system which is marked as depending on a third sub-system, said first sub-system is recursively marked as depending on said third sub-system. Furthermore no two subsystems are marked as depending on each other. Integrity constraints between an item of data in one sub-system and an item of data in another sub-system is admitted provided that one of these sub-systems is marked as depending on the other one. Recovery actions are performed on a sub-system so as to only result in changing items of data of that sub-system and of sub-systems marked as depending on it.

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