JPH0440536A - Distributed management method for data - Google Patents

Abstract

PURPOSE:To efficiently execute the distributed management of data by inquiring the version number of necessary data of a host side, when data is necessary in a terminal side, and transferring the data to the terminal side from the host side, only in the case said number is not equal to the version number stored in the terminal side. CONSTITUTION:In a host side 10, the latest data and its version number are stored, and in a terminal side 20, when data is necessary, the version number of necessary data is inquired of the host side 10, a result of inquiry and the version number stored in the terminal side 20 are compared, and when a result of comparison is equal, the data stored in the terminal side 20 is outputted. On the other hand, when the result of comparison is not equal, the data is transferred and outputted from the host side 10 to the terminal side 20, and in the case the data is transferred, the transferred data and its version number are stored in the terminal side 20. That is, when the data is necessary, and also, only when its latest data does not exist, the transfer is executed. In such a way, the distributed management of the data can be executed efficiently.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a data decentralized management method for sharing data such as drawing data, document data, or a large amount of numerical data among multiple offices, and is lower in cost than conventional methods. The purpose is to provide an efficient distributed management method for data with a low level of data loss.The host side stores the latest data and its version number, and the terminal side stores the required data version number when the data is needed. Inquire the host side, compare the inquiry result with the version number stored on the terminal side, and if the comparison results are equal, output the data stored on the terminal side, and if the comparison results are not equal, the host side The system is configured to include the steps of transferring data from the terminal to the terminal side and outputting it, and storing the transferred data and its version number on the terminal side when data is transferred.

[Industrial application field]

The present invention relates to a data distributed management method for sharing data such as drawing data, document data, or large amounts of numerical data among multiple offices.

As optical discs, which are media capable of storing large amounts of data, have come into practical use, data such as drawing data and document data can be stored on optical discs and used jointly by multiple offices. It is starting to be practiced.

In this case, care must be taken that this type of data is always subject to change due to technological improvements or system changes, and in such cases, it must be kept up-to-date and error-free at all business establishments. This means that it is necessary to keep the data accessible.

The present invention relates to a data distributed management method for realizing this.

[Conventional technology]

Conventionally, this type of management method has been broadly classified into two types.

One of these is a centralized management method, in which all data is stored on the host side, and when data is needed at each office, it is sent from a terminal installed at each office via a communication line. This method issues a transfer request to the host side and receives the data via a communication line.

The other method is called the differential method, in which the necessary data is stored on each terminal, and the host side transfers the data to each office each time there is an update, regardless of whether there is a demand for it or not. be.

In this case, a method is also used in which the type of data to be handled is determined in advance according to the characteristics of each business establishment, the data is classified by type, and the data is transferred only to the relevant business establishment.

Specific transfer methods include a method of distributing optical disks on which data is stored to each office, and a method of transmitting data via a public line or a private line.

[Problem to be solved by the invention]

As a communication line, using a public line is the easiest to implement and is highly flexible. However, due to the limited transmission speed, it takes a considerable amount of time and is expensive to send large amounts of data. This time can be reduced by using a dedicated line and increasing the transmission speed, but this also has its limits and requires large installation costs.

Therefore, the centralized management method, which requires the use of a communication line every time data is required, is disadvantageous in these respects. The same applies to the case where communication lines are used in the differential method. In the method of distributing the optical disc itself, the work of periodically updating the storage with the data stored on the optical disc received by the receiver is complicated, which is cumbersome.

In addition, for methods other than the source management method, it is necessary to predict the type of data required for each terminal and to make arrangements in advance to send only the relevant data.

Therefore, an object of the present invention is to provide a data distribution management method that is lower in cost and more efficient than conventional methods.

[Means to solve the problem]

The distributed data management method of the present invention stores the latest data and its version number on the host side, and when the terminal side needs data, queries the host side for the version number of the required data, and the inquiry results and the version number stored on the terminal side, and if the comparison results are equal, the data stored on the terminal side is output, and if the comparison results are not equal, the data is transferred from the host side to the terminal side. The present invention is characterized by comprising steps of outputting the data and, when data is transferred, storing the transferred data and its version number on the terminal side.

[For production]

Each of the above steps can be executed automatically according to the terminal side program and some host side programs, and does not require any periodic update work.

Furthermore, the method of the present invention has characteristics intermediate between the unified management method and the differential method, and is efficient because data is transferred only when the data is needed and the latest data is not available.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A drawing data distributed management method as an embodiment of the present invention will be specifically described below with reference to the drawings.

It goes without saying that document data and numerical data other than drawing data can be handled in the same way.

FIG. 1 is a diagram showing a schematic configuration of a system in which the method of the present invention is implemented.

The center 10 and the plurality of terminals 20 are mutually connected via a public line or a private line 30. The storage device 102 on the center 10 side contains a drawing data file 108 that stores the drawing data itself, and information such as the drawing number and version number of each stored drawing data, and a data pointer indicating the storage location of the corresponding drawing data. An area for the drawing information file 106 to store the information is reserved. The file processing device 100 stores or updates information in the drawing data file 108 and the drawing information file 106, reads the information therefrom, and outputs the information to an output device (not shown) or via the transmission device 104 and the line 30. It has functions such as transmitting information to each terminal 20. Also,
In order to realize the method of the present invention, it is essential to have a function of reporting the version number of drawing data in response to an inquiry from the terminal 20.

Similarly, areas for a drawing data file 220 and a drawing information file 218 are secured in the storage device 216 on the terminal 20 side, but their contents, especially the version number, etc., do not necessarily match those on the center 10 side. File processing device 20
0 is connected to the center 10 via the line 30 and the transmission device 202.
It has functions such as receiving drawing data etc. from the computer, storing it in the storage device 216 or updating the stored contents, and outputting the drawing data to its own display or printer 204. personal computer 206
is connected to a file processing device 200, a human power device 208, and a storage device 210 that stores a processing program 214 and a drawing number 212 to be processed.
The drawing number to be outputted from B is input and temporarily stored in the storage device 210, and processing such as determining the drawing data to be received from the center 10 side and instructing the file processing device 200 is performed. Note that it is also possible to provide the file processing device 200 with all the functions of the personal computer 206.

FIG. 2 is a flowchart showing the processing procedure when outputting a necessary drawing on the terminal side in the system shown in FIG. 1.

First, the drawing number of the drawing to be output is input from the human-powered device 208 (step a). If there are multiple drawing numbers input at this time, they are temporarily stored in the storage device 210 as indicated by reference number 212, and the following processes are performed in the order of input. Regarding drawings to be output, data is sent from the personal computer 206 to the file processing device 200 and the transmission device 202.
, the line 30, and the transmission device 104 in this order, the file processing device 100 is inquired about the latest version number, and the file processing device 200 reads the version number of the corresponding drawing from the drawing information file 106 in the storage device 102, and performs the above-mentioned process. The values are returned to the personal computer 206 in the reverse order (
Step b). Next, the personal computer 206 reads the version number of the corresponding drawing stored in the drawing information file 218 in the storage device 216 via the file processing device 200 (Step C), and compares the two to obtain the latest version of the drawing to be output. It is checked whether the version is held on the terminal 20 side (step d), and if it is held, it is read out, but if it is not held, it is sent to the center 10 through the above-mentioned route.
The drawing data on the side is ordered via the line 30 (step e). The drawing data read from the storage device 216 or transmitted is displayed on the display (step g) or output to the printer 204 (step f) in accordance with instructions from the input device 208. After that, if the output drawing data is the one ordered from the center 10 side, the drawing data is stored in the storage device 21G.
Update the drawing data in and update the version number. In addition, even if the version number of the corresponding drawing is not stored in the storage device 216 because the drawing data is used for the first time on the terminal 20 side, the drawing data is requested by transmission and is newly stored after being output. Of course.

According to this method, when the drawing at the center is changed or updated, there is no need to transmit the changed drawing data to the terminal side, so there is no need to periodically monopolize the line. Also,
Data that has been requested once is stored in the own terminal, and when used again, as long as it has not been revised, it is used as is, so there is no need to request the exact same data twice, and there is no waste in data transmission.

10... Center, 20... Terminal, 100,
200...File processing device, 102, 210.21
6... Storage device, 104, 202... Transmission device, 106, 218... Drawing information file, 108, 22
0...Drawing data file, 206...Personal computer.

〔Effect of the invention〕

As described above, according to the present invention, more efficient and reliable distributed management of data can be realized than conventional methods.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a system in which a drawing data distributed management method according to an embodiment of the present invention is implemented, and FIG. 2 is a flowchart showing an embodiment of the present invention. In the figure,

Claims (1)

[Claims] 1. The latest data and its version number are stored on the host side, and when data is required on the terminal side, the host side is inquired about the version number of the required data, and the inquiry result and the terminal are stored. Compare the version numbers stored on the host side, and if the comparison results are equal, output the data stored on the terminal side, and if the comparison results are not equal, transfer the data from the host side to the terminal side and output it. A data distributed management method characterized by comprising each step of storing the transferred data and its version number on the terminal side when the data is transferred.