Boots – shoes – and leggings
Patent
1993-10-08
1995-08-08
Black, Thomas G.
Boots, shoes, and leggings
364DIG1, 3642824, 3642833, 3642834, G06F 1730
Patent
active
054407354
ABSTRACT:
A relational data base management system permits users to specify copy operations without being burdened with specifying details of structure, copy refresh algorithm, and the like. The attributes a user must specify when requesting snapshot copies is reduced by defining data structures with attributes such that specifying the name of a table, whether a user data table or snapshot, specifies the copying scheme that will be used. Any ambiguity is resolved by interactively querying the user. When a user initially defines, or registers, a source table, the user specifies a set of predefined attributes, including table structure and completeness. When a user later requests a snapshot copy, the system automatically determines the nature of the copy operation to be performed by matching the table name with its registered attributes. This permits the system to automatically determine details such as the structure of the target table, the manner in which snapshot refresh will occur, and whether the target table can be created from a snapshot copy or if the original user table must be consulted. In this way, specifying copies in a relational data base system is simplified.
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Bo Kahler and Oddvar Risnes, "Extended Logging for Database Snapshot Refresh," Proceedings of the 13th International Conference on Very Large Data Bases, Brighton, England, Sep. 1-4, 1987, pp. 389-398.
Black Thomas G.
International Business Machines - Corporation
Loomis John C.
LandOfFree
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