JPH05233558A - Decentralized data processing system - Google Patents

Abstract

PURPOSE:To improve the overall data using efficiency in a decentralized data processing system by transferring a data transfer request given from a terminal computer system to this requester as long as the data are not used at the receiver side although the relevant data are transferred to another terminal computer system. CONSTITUTION:A central data controller 10 of a central computer system 1 is provided with a data owner control means 13 and a data owner table 14 and controls the receiver side of data. A data control means 11 receives a data transfer request from a terminal computer system 2 and then transfers it via a data transfer means 12 as long as the data are not used. Then the means 13 registers the receiver side into the table 14. If the data are used, the receiver side is retrieved out of the table 14 and a data control means 32 of a terminal computer system 3 confirms the using state of the data. If the date are not used then, the data are transferred to a requester and the corresponding data are deleted out of a terminal data storage 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed data processing system, and more particularly to a distributed data processing system in a computer system for newspaper production.

[0002]

2. Description of the Related Art Generally, a distributed data processing method in a computer system for newspaper production uses a central computer system equipped with a large-capacity central data storage device and a high-speed central data control device to control all data. The terminal computer system that is connected to this central computer system and performs data processing requests the central computer system to transfer the data as needed, and when the processing for the data is completed, the central computer system returns to the central computer system again. It is designed to write back data.

The terminal computer system normally issues a data transfer request to the central computer system at the instruction of the operator, but at this time, simultaneously requests a plurality of related data for improving work response on the terminal,
Incorporated into the terminal computer system. The data thus taken into the terminal computer system, in other words the data transferred from the central computer system to the terminal computer system, is locked by the data controller of the central computer system,
It is designed not to respond to transfer requests from other terminal computer systems.

Next, a conventional method will be described with reference to FIG. First, when an operator who operates a terminal gives an instruction for some business, the terminal computer system 5 sends to the central computer system 4 a transfer request (a) of all data necessary for the instructed business. When the central data control device 40 of the central computer system 4 confirms that the requested data is not in use, it reads the corresponding data from the central data storage device 45 (b),
Terminal data storage device 53 of terminal computer system 5
(C). When the work in the terminal computer system 5 is completed and the data is returned (d, e), the terminal data storage device 53 writes back the data updated by the work in the central data storage device 45 (f, g). In the above series of flow, the data transferred between the central data storage device 45 and the terminal data storage device 53 always passes through the central data control device 40, and while the data is on the terminal computer system 5 ( (between c and f), the central data control device 40 performs exclusive control of data so as not to accept a request from another terminal computer system for the same data.

[0005]

In the above-mentioned conventional distributed data processing system, since a plurality of data are simultaneously transferred to the terminal computer system, the terminal computer system will not respond to the operator's instruction expected thereafter. Although it can respond promptly, when there is a transfer request from another terminal computer system, the central computer system will There is a drawback that the requested data cannot be transferred to another terminal computer system that requested the data later, and the efficiency of using the data is deteriorated as a whole.

An object of the present invention is to provide a distributed data processing system which can solve the above-mentioned drawbacks and can improve the data use efficiency as a whole.

[0007]

A distributed data processing system of the present invention includes a central data storage device in which various data are stored, and a central data control device for performing exclusive control of data utilization of the central data storage device. In a distributed data processing system in which a plurality of terminal computer systems are connected to a central computer system having, a data owner management means for storing and managing a data transfer destination in a table in the central data control device; When a transfer request is received for data that has already been transferred, the data control means refers to the data owner management means to check the usage status at the transfer destination to determine whether the transfer is possible, Each of the terminal computers, comprising: a data transfer unit that transfers data from a central data storage device. The stem of the terminal data control unit is configured to include a data management means responsive to an inquiry from the central computer system to manage the use state of the data being transferred stored in the own system.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the distributed data processing system of this embodiment, as shown in FIG. 1, the central data control device 10 of the central computer system 1 has a data control means 11 and a data transfer means 1.
2. The data owner management means 13 and the data owner table 14 are provided, and the terminal data control devices 20 and 30 of the terminal computer systems 2 and 3 are provided with the data control means 21 and 31 and the data management means 22 and 32, respectively. Is configured.

When the terminal data control device 20 of the terminal computer system 2 receives an instruction from the operator, the data control means 21 sends a request to transfer not only the directly instructed data but also related data necessary for the business, from the central computer system. 1 to the central data control device 10.

When the data control means 11 of the central data control device 10 receives the data transfer request from the terminal data control device 20, if the requested data is not locked (it is being used by another terminal computer system). If not), the transfer instruction of the data is sent to the data transfer means 12. In response to this, the data transfer means 12 reads out the requested data from the central data storage device 15 and transfers it to the terminal computer system 2. When the transfer is completed, the transfer destination of the data is registered in the data owner table 14 via the data owner management means 13.

When the requested data is locked, that is, when the same data has already been transferred to the terminal computer system 3, the data control means 11 receiving this request informs the data owner management means 13. Send a request to check the data usage status. Upon receipt of the confirmation request, the data owner management means 13 searches the data owner table 14, finds the owner of the corresponding data (terminal computer system 3), and uses it in the data management means 32 of the terminal computer system 3. Send a confirmation request.

Upon receipt of this, the data management means 32 confirms the usage state of the instructed data in its own system, and returns a negative response to the data owner management means 13 of the central computer system 1 if it is in use, If it is not in use, a positive response is returned and the corresponding data is deleted from the terminal data storage device 33 of the own system.

The data owner management means 13 returns the response result from the data management means 32 to the data control means 11.
If the response result is a negative response, the data control means 11 returns nothing to the data control means 21 of the requesting terminal computer system 2 to the effect that transfer is impossible. If the response result from the data management means 32 is a positive response, the data control means 11 sends an instruction to transfer the requested data to the data transfer means 12. The data transfer means 12 transfers the designated data to the data control means 21 of the terminal computer system 2 which is the request source, and at the same time, the data control means 11 updates the data owner table 14 via the data owner management means 13. Then the processing is completed.

[0016]

As described above, according to the distributed data processing method of the present invention, even if the data is transferred to another terminal computer system when the data transfer request is made from the terminal computer system, Since the terminal computer system of the transfer destination is inquired and the requested data can be transferred to another terminal computer system if it is not in use at that time, there is an effect that the overall data use efficiency is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a conventional distributed data processing method.

[Explanation of symbols]

 1,4 Central computer system 2,3,5 Terminal computer system 10,40 Central data control device 11,21,31 Data control means 12 Data transfer means 13 Data owner management means 14 Data owner table 15,45 Central data storage Device 20, 30 Terminal data control device 22, 32 Data management means 23, 33, 53 Terminal data storage device

Claims (1)

[Claims] 1. A central computer system having a central data storage device for storing various data and a central data control device for performing exclusive control of data utilization of the central data storage device, wherein a plurality of terminal computer systems are provided. In the connected distributed data processing method, the central data control device stores data transfer destinations in a table and manages data owner management means, and a transfer request for data that has already been transferred in response to a data transfer request. Data control means for referring to the data owner management means to check the usage status at the transfer destination and judging whether the transfer is possible, and data transfer for executing data transfer from the central data storage device according to an instruction from the data control means. And means
The terminal data control device of each terminal computer system is provided with a data management means for managing a use state of data transferred and stored in the own system and responding to an inquiry from the central computer system. Data processing method.