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    • 6. 发明申请
    • Method and system for managing multiple database storage units
    • 用于管理多个数据库存储单元的方法和系统
    • US20050027759A1
    • 2005-02-03
    • US10929699
    • 2004-08-30
    • Masashi TsuchidaNobuo KawamuraNobuyuki Yamashita
    • Masashi TsuchidaNobuo KawamuraNobuyuki Yamashita
    • G06F11/14G06F11/20G06F12/00G06F17/30G06F7/00
    • G06F11/2094G06F11/2097G06F17/30575G06F2201/80Y10S707/954Y10S707/99931Y10S707/99932Y10S707/99934Y10S707/99938Y10S707/99945Y10S707/99953Y10S707/99955
    • The system manages at least a database in multiple database storage units, and the database is duplicated for redundancy. The system maintains the database redundancy for security. The system enables the maintenance and reorganization of the database storage units without interrupting the on-going operations involving the access to the database storage units. The non-stop ongoing database access is available by allocating a pair of a main storage unit and an intermediate storage unit that maintains the substantially identical data. During certain predetermined operations, the main storage unit is being dedicating to the on-going transactions while the intermediate database storage unit is manipulated to contain data that corresponds to a specified time. For example, the content of the intermediate storage is subsequently copied or used to update another database. When the above duplication or incorporation is completed, the intermediate storage unit is updated for the transactions that have taken place during the above operations to be synchronized with the main storage unit.
    • 系统至少管理多个数据库存储单元中的数据库,并且重复数据库以进行冗余。 系统维护数据库冗余以实现安全。 该系统能够维护和重组数据库存储单元,而不会中断正在进行的涉及对数据库存储单元的访问的操作。 可以通过分配一对主存储单元和维持基本上相同的数据的中间存储单元来获得不间断的数据库访问。 在某些预定操作期间,主存储单元被专用于正在进行的事务,而中间数据库存储单元被操纵以包含对应于指定时间的数据。 例如,中间存储器的内容随后被复制或用于更新另一个数据库。 当上述复制或并入完成时,中间存储单元被更新为在上述操作期间发生的与主存储单元同步的事务。
    • 9. 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。