Integrated database system and program storage medium
AssigneeHitachi, Ltd.
InventorsKazutomo Ushijima, Itaru Nishizawa, Takahiko Shintani
Life of this patent
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Abstract
By corresponding the external databases to the predicates used in query processing according to a predetermined ontology, it is allowed to issue a query through the ontology. The query thrown into the integrated database is expanded into the set of approximate queries according to approximation rules provided in the ontology. The optimization module refers to the query capability of the external databases to perform the query optimizing in which these approximate queries can be executed efficiently as a whole.
Claims7
An integrated database system for performing query processing by combining a plurality of external databases, comprising:
- a predicate dictionary including information on connections among predicates used in the query processing and on strengths of the connections;
- and
- query expansion means for referring to the connections among predicates and the strength of the connections included in the predicate dictionary to convert a query, which is thrown into the integrated database system, into one or more query sets.
A program storage medium for storing a program which realizes an integrated database system for performing query processing by combining a plurality of external databases, the program storage medium storing:
- a predicate dictionary including information on connections among predicates used in the query processing and on strengths of the connections;
- and
- a program for realizing query expansion processing which refers to the predicate dictionary to convert a query, which is thrown into the integrated database system, into one or more query sets.
Dependencies are inferred from the claim text.