Efficient implementation of typed view hierarchies for ordbms

Details Efficient implementation of typed view hierarchies for ordbms Efficient implementation of typed view hierarchies for ordbms

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2310577

A method for typed view hierarchies for an object-relational database management (ORDBMS). The views in the hierarchy are merged into a unified hierarchy view through case expressions for mapping and wrapping of overloaded columns. During the merge, the underlying logical tables are eliminated which results in a simplified query graph. The transformation is a non- loss operation which condenses the type information within the case expressions. This allows update, delete and insert operations to be resolved on the query graph on a local level. Using query rewrite rules, the case expressions may be simplified further.

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