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    • 16. 发明授权
    • Method apparatus for determining prefetch operating for a data base
    • 用于确定数据库的预取操作的方法装置
    • US5317727A
    • 1994-05-31
    • US353698
    • 1989-05-17
    • Masashi TsuchidaKazuhiko OhmachiToshio HonmaYasuhiro ImaiNobuo Kawamura
    • Masashi TsuchidaKazuhiko OhmachiToshio HonmaYasuhiro ImaiNobuo Kawamura
    • G06F12/00G06F17/30G06F15/403
    • G06F17/3048Y10S707/99932
    • 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.
    • 一种数据库处理方法,包括:中央处理单元,用于分析从多个用户进行的多个查询,以便确定相对于数据库的内部处理过程,并用于执行内部处理过程; 用于存储能够被每个用户共享的数据的辅助存储器; 以及输入/输出控制处理单元,其包括至少一个高速缓存存储器,用于控制中央处理单元和辅助存储器之间的输入/输出处理操作所需的多个记录的传送。 数据库处理方法的特征在于,通过判断由查询形成的内部处理过程,判定在输入/输出处理操作开始时是否执行预取操作; 当执行预取操作时,形成已经存储了要获取的记录的检索范围; 并且,考虑到内部处理过程的访问特性以及包含高速缓冲存储器的大小,中央处理单元的性能的系统特性,将预取记录号确定为输入/输出处理需求单元, 以及输入/输出处理单元的流量。