JPH03110643A - Master file operating system - Google Patents

Abstract

PURPOSE:To enable a user to not only quickly refer to a master life with data processing terminal but also independently operate the master file by arranging the same information as the master file in each data processing terminal. CONSTITUTION:A data processor 11 functions as the host device of a system and is provided with a master managing part 12, an original master file storage part 13, a history file storage part 14, a pointer table 15, a master updating part 16, and an operating master file storage part 17. Data processors 21 and 31 function as terminal equipments, and copies of the file stored in the original master file storage part 13 are stored in operating master file storage parts 24 and 34, and master updating parts 23 and 33 refer to the pointer table 15 and the history file storage part 14 to update contents of operating master file storage parts 24 and 34. Thus, each data processor refers to the operating file in the processor itself to not only independently operate the master file but also perform the data processing at a high speed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a master file operation method, and particularly to a master file operation method in a computer system in which a plurality of data processing devices share a master file. .

(Prior Art) Generally, in a distributed processing system in which a plurality of data processing terminals such as workstations are interconnected via a LAN, one master file is commonly operated by each data processing terminal.

That is, the master file is used as a common data database among a plurality of data processing terminals, and is located only in the host device (or the data processing terminal serving as a key station) within the distributed processing system. Therefore, when a data processing #terminal other than the host device refers to the master file, it is necessary to access the master file of the host device via the LAN.

As described above, in conventional distributed processing systems, data is distributed to each data processing terminal for processing, but a unified management method has been adopted in which the master file is managed only by the host device.

Therefore, each data processing terminal must refer to the master file via the LAN, which has the drawback that it takes time to refer to the master file.

Furthermore, when the host device is not operating, each data processing terminal cannot refer to the master file, so there is a drawback that data processing using the master file cannot be performed independently on each data processing terminal. Ta.

(Problems to be Solved by the Invention) Conventionally, the master file is located only in the host device, and it takes time for the data processing terminal to refer to the master file, and the master file must be operated independently for each data processing terminal. There was a drawback that it could not be done.

This invention was made in view of these points, and it enables the same information as the master file to be placed not only in the host device but also in each data processing terminal in the system, thereby speeding up the reference of the master file by the data processing terminal. , and to provide a master file operation method that can realize independent operation of the master file for each data processing terminal.

[Structure of the Invention] (Means and Effects for Solving the Problems) A master file operation method according to the present invention is provided in a computer system in which a plurality of data processing devices share a master file. A predetermined data processing device includes a master file storage means in which the master file is stored, and an update history storage that holds update request information from each data processing device to the master file in record units for each data processing device. and a pointer table that holds a first pointer indicating the last record of the update request information held in the update history storage means and a second pointer indicating the updated record for each data processing device. , each of the other data processing devices includes an operational file storage means in which a copy of the master file is stored, and a copy of the master file stored in the update history storage means with reference to the first and second pointers of the pointer table. The present invention is characterized by comprising an operational file updating unit that detects an unupdated record in the system and updates the operational file storage unit according to the contents of the unupdated record.

In this master file operation method, a master file is placed in a data processing device that functions as a host device or a key station, and a copy of the master file is placed in each other data processing device as an operational master file.

The contents of the operational file storage means in which the operational master file is stored are updated by the operational file update means according to the contents of the update history storage means in which update request information is held.

Therefore, an update request for the master file can be reflected in the operational file, and even if the contents of the master file are updated, the contents of the master file and the operational file can be made the same.

Therefore, the same information as the master file can be placed not only in the host device but also in each data processing device in the system, which speeds up the reference of the master file by each data processing device, and also allows each data processing device to create a master file for each data processing device. independent operation becomes possible.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a system configuration for realizing a master file operation method according to an embodiment of the present invention. Although this system constitutes a distributed processing system, only the functions related to the master file operation method of the present invention are representatively shown here.

The data processing bag 2211 functions as a key station (or host device) of this system,
It includes a mask management section 12, a master file storage section 13, a history file storage section 14, a pointer table 15, a mask update section IB1 operational mask storage section 17, and a man-machine interface device 18 including a keyboard, display, and the like.

The mask management unit 12 performs update processing of files in the master file storage unit 18 in units of Lou codes in response to a file update request input from an operator via the man-machine interface device f1g.

The mask management unit 12 also controls the master file storage unit 1.
The contents of the update process for the file No. 3 are written in the history file storage section 14 in units of Lou codes.

A plurality of files are stored in the master file storage unit 13, and these files are used as a common database for each data processing device in this system. The contents of this main master file storage section 13 are updated not only by the data processing device 11 but also by each of the other data processing devices 21, 31 in this system.

The history file storage unit 14 retains the contents of update processing for the main master file storage unit 13 by the mask management unit 12 of the data processing device 11, and also
From 1.31 onwards, the contents of update processing for the master file storage section 13 are also held in units of Lou codes.

An example of the contents stored in the WJl history file storage section 14 is shown in FIG. As shown in FIG. 2, the history file storage unit 14 stores the file symbol of the update request target, the format of the update processing command, and the content of the change in units of Lou codes. Update processing instructions include rewriting, addition, deletion, and the like.

Here, the file (F
1) is rewritten to the content registered in the change content column by a rewriting command (W), and the specified record of the file (F2) in this master file storage unit 13 is changed by a deletion command (CD). When the content registered in the content field is deleted, and when a predetermined record of the file (F3) in the master file storage unit 13 is rewritten with the content registered in the changed content field by a rewrite command (W). The following cases are shown. In this way, the history file storage unit 14 holds new content that is changed by the update process.

The pointer table 15 holds a final pointer indicating the final record number of the history file storage unit 14, and A pointers, B pointers, and C pointers indicating updated record numbers corresponding to data processing devices 11 and 21.31, respectively. There is.

For example, the history file storage unit 14 holds update contents as shown in FIG. Assuming that the data processing device 31 has executed up to the update process for a predetermined record of the file (F2), the final pointer, the A pointer, and the A pointer held in the pointer table 15 are
The values of the B pointer and C pointer are 3.3.2.
Becomes 1.

The mask update unit 1B updates the contents of the operational master file storage unit 17, in which a copy of the contents of the main master file 13 is stored, by checking the pointer table 15 and the history file storage unit 14.

That is, the mask update unit 1B updates the pointer table 15
Compare the values of the final pointer and A pointer! An unupdated record held in the 1-history file storage section 14 is detected, and the contents of the operational master file storage section 17 are updated according to the contents of the detected unupdated record.

The operational master file storage section 17 stores a copy of the file stored in the main master file storage section 13, and data processing by the data processing device 11 is executed by referring to this operational master file storage section 17. be done.

The data processing device 21 functions as a terminal device of this system, and includes a master management section 22 and a mass update section 2.
3, an operational master file storage section 24, and a man-machine interface device 25 including a keyboard, display, etc.

The mask management section 22 performs a process of updating files in the master file storage section 13 in the data processing device 11 in units of Lou codes in response to a file update request input from an operator via the man-machine interface device 25. Further, the mask management unit 22 writes the contents of the update process for the file in the main master file storage unit 13 to the history file storage unit 14 in units of Lou codes.

The mask update unit 23 updates the contents of the operational master file storage unit 24 in which a copy of the contents of the main master file 13 is stored by referring to the pointer table 15 and the history file storage unit 14.

That is, the mask update unit 23 updates the pointer table 15
The values of the final pointer and the B pointer are compared to detect an unupdated record held in the history file storage section 14, and the contents of the operational master file storage section 17 are updated according to the contents of the detected unupdated record.

The operational master file storage section 24 stores a copy of the file stored in the main master file storage section 13, and data processing by the data processing device 21 is executed by referring to this operational master file storage section 24. be done.

The data processing device 31 also functions as a terminal device of this system, and like the data processing device 21, it has a mask management section 32, a master update section 33, an operational master file storage section 34, and a manual including a keyboard, display, etc. A machine interface device 35 is provided.

The mask management section 32 performs a process of updating files in the master file storage section 13 in the data processing device 11 in units of Lou codes in response to a file update request manually input from an operator via the man-machine interface device 35. Further, the mask management unit 32 writes the contents of the update process for the file in the main master file storage unit 13 to the history file storage unit 14 in units of Lou codes.

The mask update unit 33 updates the contents of the operational master file storage unit 34 in which a copy of the contents of the main master file 13 is stored by referring to the pointer table 15 and the history file storage unit 14.

That is, the mask update unit 33 updates the pointer table 15
The values of the final pointer and the C pointer are compared to detect an unupdated record held in the history file storage section 14, and the contents of the operational master file storage section 34 are updated according to the contents of the detected unupdated record.

The operational master file storage section 34 stores a copy of the file stored in the main master file storage section 13, and data processing by the data processing device 31 is executed by referring to this operational master file storage section 34. be done.

Next, with reference to the flowchart of FIG. 3, the operational master file update processing operation for reflecting the contents of the history file storage unit 14 in the operational master file of each data processing device will be described.

A program for executing the operational master file update processing operation is started for each data processing device when the machine is started up, and is always run when the data processing device is in an operating state.

Therefore, first, in each data processing device, it is determined whether or not a program stop is requested by the operator (
Step AI). If a request is made to stop the program, the operation master file update processing operation is terminated. On the other hand, if there is no request to stop the program, the following operational master file update processing operation is executed.

First, each data processing device uses the final pointer of the pointer table 15 and the pointer of the updated record corresponding to the data processing device to detect whether there are any unupdated records remaining in the history file storage unit 14. Refer to (step A2).

For example, in the case of the data processing device 21, the values of the final pointer and B pointer are compared.

If the value of the final pointer is greater than the value of the updated record pointer of the own device, it is recognized that unupdated records remain in the history file storage section 14. If unupdated records remain as described above, the operation master file of the own device is updated in accordance with the unupdated records (step A3).

Then, it was waited for a predetermined period of time (
After step A4), the processes of steps At to A3 are executed again.

In this way, the operation master file update process is executed at regular intervals while the data processing apparatus is in operation.

As described above, in this master file operation method, the operation master file is updated according to the contents of the history file storage section 14 in which update requests are held. Therefore, an update request for the master file can be reflected in the operational file, and even if the contents of the master file are updated, the contents of the master file and the operational file can be made the same.

Therefore, the same information as the master file can be placed not only in the host device but also in each data processing device in the system. As a result, each data processing device can operate the master file independently by referring to its own operational file, and can also realize high-speed data processing by referring to the operational file.

[Effects of the Invention] As described above, according to the present invention, the same information as the master file can be placed not only in the host device but also in each data processing device in the system, which speeds up the reference of the master file by the data processing terminal. , and independent operation of the master file for each data processing terminal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a system configuration for realizing a master file operation method according to an embodiment of the present invention, and FIG. 2 is a history file storage provided in the host device of the system shown in FIG. FIG. 3 is a flowchart illustrating the operation of the system shown in FIG. 1. +1.21.31...data processing device, 12.22.
32... Mask management unit, 13... Main master file storage unit, 14... History file storage unit, 15... Pointer table, IB, 23.33... Mask update unit, 17.24. 34...Operational master file storage unit.

Claims (1)

[Scope of Claims] In a computer system in which a plurality of data processing devices commonly use a master file, a predetermined data processing device among the plurality of data processing devices includes a master file storage means in which the master file is stored. and update history storage means for storing update request information from each of the data processing apparatuses for the master file in record units for each data processing apparatus, and a final record of update request information held in the update history storage means. and a pointer table holding a second pointer indicating an updated record for each of the data processing devices, and each of the other data processing devices stores a copy of the master file. detects an unupdated record stored in the update history storage means by referring to the first and second pointers of the pointer table; A master file operation method comprising: an operation file update means for updating according to contents.