Research on Integrating Ordbms and Rough Set Theory

It is a new application area that integrating rough set theory and ORDBMS to implement data mining in ORDBMS. A suitable rough set algebra must be designed to implement the tight coupling between rough set and ORDBMS. Equivalence matrices algebra doesn’t meet this requirement and must be extended. We extend the equivalence matrices algebra to define the low and upper approximation, relative core and reduction. A prototype system has been designed and implemented in our research, called RSORDMS, adding data mining capabilities to ORDBMS while preserving its traditional power. In the prototype system, a technique is adopted which combines rough set with SQL to make data cleaning and core computation very fast, which can be proved by experiments. The whole prototype system has a good performance.