Boots – shoes – and leggings
Patent
1991-05-08
1995-04-18
Lall, Parshotam S.
Boots, shoes, and leggings
3642305, 3642824, 3642844, 395600, G06F 1314
Patent
active
054086086
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a temporary center system in a distributed data base system consisting of a plurality of terminal units connected in the network system.
In these years, a distributed processing system or distributed data base system (hereinafter referred to as distributed data base system) has been structured with a plurality of terminal units connected to the public or private network. In such a system, the data bases provided in each terminal unit are distributed in many areas coupled through a real time network (communication network) and the capability for processing such data bases is also distributed.
The distributed data base system naturally provides a greater part of necessary data within the data base of self terminal units. However, if the necessary data is provided in other terminal units, such data must be received through the network. Therefore, in this case, the distributed data base system is required to improve the disadvantage that a longer period of time is taken for transfer of data.
2. Background of the Invention
A data base system has been structured in these years with the terminal units, which are connected in the network, and provide a plurality of information processing functions. From the view point of control, the conventional data base systems may be classified into the centralized type system and distributed type data base system. The centralized data base system controls all data bases with the one center host and retrieves necessary information by accessing the center host from the other terminal units.
This system has a problem in that the center host becomes large in scale and the load of the center host becomes excessive because accesses from the other terminal units to the center host are centralized. As a system to solve such a problem, a distributed type data base system has been used. In the case of this data base system, a plurality of terminal units connected in the network system is respectively provided with data base to be controlled by each terminal unit.
A conventional distributed data base System will be explained with reference to FIG. 16. In this figure, T1-T4 denote terminal units, T1-T4 respectively providing information processing means (CPU, memory, input/output unit, file unit, etc.). F denotes a file for storing data bases stored in each terminal unit. NW denotes a network (public network or private network).
FIG. 16A indicates the basic structure of a distributed data base system. A plurality of terminal units T1-T4 provides a greater part of necessary data within the data base thereof. However, in case the data base is provided in other terminal unit (in case it is detected the related data is provided in the other terminal unit), the terminal unit requests the data by sequentially making inquiries to the other terminal units through the network. For instance, when the terminal unit T1 requests data from terminal unit T2, the data is extracted from a file unit in the terminal unit T2 when such data exists therein, such data is then transferred to the terminal unit T1 through the network.
In the conventional distributed type data base system shown in FIG. 16A, in case each terminal unit does not have the data of the other terminal units in the data base of the self terminal unit, when each terminal unit cannot find the necessary data by retrieving the data base of the self terminal unit, each terminal unit sequentially issues an inquiry to the other terminal units whether there is the necessary data or not through the network system. When a certain other terminal unit has such data, each terminal unit receives the necessary data from such other terminal unit through the network. Thereby, there is a problem in that the load applied on the terminal units and network becomes excessive.
Moreover, in case each terminal unit always holds all data in the system, this system has a problem in that when data is generated, such data must be transferred to each terminal unit and thereby a loa
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Araki Hiroshi
Endo Mamoru
Fukatsu Takanori
Hashimoto Akira
Kakehi Gen
Fujitsu Limited
Lall Parshotam S.
Lim Krisna
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