Data processing: database and file management or data structures – Database design – Data structure types
Patent
1998-01-23
1999-03-30
Kulik, Paul V.
Data processing: database and file management or data structures
Database design
Data structure types
707 4, 707 5, G06F 1730
Patent
active
058901507
ABSTRACT:
A query issue processing method, a query conversion processing method, and a data control processing method are provided for enhancing the efficiency of random sampling processing for use in a database processing system. In query issue processing 2, a query including random sampling processing is issued. In query conversion processing 8, application sequences of random sampling processing and another query processing are exchanged by considering a sampling unit of the random sampling processing. Further, in record control processing 4, random access to a secondary storage device is reduced, thereby enhancing random sampling processing efficiency. Unlike the conventional query conversion processing not considering the sampling unit, the issuance of the query including random sampling processing and performing query conversion by considering the sampling unit allow random sampling to be applied also to a query including aggregation processing, thereby enhancing the efficiency of queries in a wider range. Reduction in the random access to the secondary storage device further enhances that efficiency.
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Fujiwara Shinji
Masai Kazuo
Nishizawa Itaru
Takahashi Yori
Ushijima Kazutomo
Hitachi , Ltd.
Kulik Paul V.
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