Boots – shoes – and leggings
Patent
1989-05-17
1994-05-31
Kulik, Paul V.
Boots, shoes, and leggings
395425, 364DIG1, 3642821, 364239, 3642394, G06F 15403
Patent
active
053177274
ABSTRACT:
In a data base processing method including a central processing unit for analyzing a plurality of queries made from a plurality of users so as to determine an internal processing procedure with respect to a data base, and for performing the internal processing procedure; a secondary storage for storing data capable of being shared by each user; and, an input/output controlling processing unit including at least one cache storage, for controlling a transfer of a plurality of records which are required for input/output processing operations between the central processing unit and secondary storage. The data base processing method is featured in that a decision is made whether or not a prefetching operation is carried out at a start of an input/output processing operation by judging the internal processing procedure which has been formed by the query; a retrieval range into which a record to be fetched has been stored is formed when the prefetching operation is performed; and, a prefetching record number is determined as an input/output processing demand unit, taking account of an access characteristic of the internal processing procedure and also a system characteristic containing a size of the cache storage, a performance, of the central processing unit, and a traffic of the input/output processing unit.
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Honma Toshio
Imai Yasuhiro
Kawamura Nobuo
Ohmachi Kazuhiko
Tsuchida Masashi
Hitachi , Ltd.
Hitachi Software Engineering Co. Ltd.
Kulik Paul V.
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