JPH10240596A - System and method for data recovery of computer system and recording medium where data restoration program is recorded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restore data which are being inputted after a fault occurs to a computer system while reproducing the process of data input processing by a user program which was in process when the fault occurs to the computer system. SOLUTION: A file input/output request accepting means 11 informs a file update difference history point managing means 12 of an input/output request from the user program 1. According to an indication from the file update difference history point managing means 12, a file update difference generating means 13 stores an update difference history in a file device 8, and a file determining means 14 generates new basic data from the basic data and update difference history and stores it in the file device 8; and a file update history data reference means 15 acquires the basic data and update difference history from the file device 8, and a file history point data generating means 16 generates update difference data for reproducing the update process of data and passes it to the user program 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recovery method for a computer system which recovers data being input at the time of occurrence of a failure in the computer system after the failure.
The present invention relates to a data recovery method and a recording medium on which a data recovery program is recorded.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 4-172543 discloses that when a failure occurs in a computer system while data is being input from a user program, the data that was being input at the time of the failure recovery after the computer system is restarted. A conventional data recovery method is disclosed. This conventional data recovery method is an electronic computer having an instruction unit for instructing start and end of transaction processing and a data processing unit for executing data processing in response to a request for the transaction processing. Means for storing the pre-update information of the target data, and the difference information between the post-update and pre-update for the data as an update record, and means for holding the final post-update data updated by the data processing means, Means for verifying the validity of the last updated data in accordance with the match / mismatch between the update record and the last updated data when the end of the transaction processing is instructed by the instructing means; When a mismatch is detected, data recovery processing is performed using the pre-update information.

[0003]

However, in this conventional data recovery method, since the data update process is not shown, it cannot be determined whether the recovered data is the data before the update or the data after the update. There is a problem. Therefore, there is a problem that it is difficult to determine from which data the input should be resumed after the data recovery.

SUMMARY OF THE INVENTION It is an object of the present invention to enable, after a failure of a computer system, the data being input by a user program at the time of the failure to be recovered, and to resume the data input processing by the user program. The purpose is to enable the user to grasp the points.

Another object of the present invention is to recover the data being input after the occurrence of a failure in the computer system while reproducing the process of data input processing by the user program which was being input when the failure occurred. Is to be able to do it.

[0006]

According to a first aspect of the present invention, there is provided a data recovery method for a computer system which stores basic data as data to be updated and a plurality of update difference histories as update information for the basic data. A file device, a file update difference history point management area that holds storage location information of the basic data and the plurality of update difference histories in the file device, and a file input / output request receiving unit that receives an update request for the basic data, Creating the update difference history corresponding to the update request for the basic data received by the file input / output request receiving means, and adding the file update difference creation means to the file device; The storage location information of the update difference history in the file device is stored in the file It is characterized in that a file update difference history point management means that you want to add to the new differential history point management area.

In a second data recovery method for a computer system according to the present invention, in the data recovery method for the first computer system, when the input / output request receiving means receives a request for creating new basic data, The file update difference history point management means, further comprising: a file determination unit that creates the new basic data based on the stored basic data and the plurality of update difference histories and adds the new basic data to the file device. The storage location information of the new basic data created by the file determination means in the file device is added to the file update difference history point management area.

According to a third aspect of the present invention, in the data recovery method of the second computer system, the file update difference history point management means stores the new basic data in the file update difference history point management area. After adding the storage location information of the data in the file device, the storage location information relating to the basic data and the plurality of update difference histories stored in the file update difference history point management area before that is added to the file update difference. Deleting from the file device the basic data and the plurality of update difference histories related to the storage location information deleted by the file update difference history point management means. Features.

A fourth data recovery method for a computer system according to the present invention is the data recovery method for the third computer system, wherein when the input / output request receiving means receives a request for obtaining the latest data, the data is stored in the file device. File history point data creation means for creating and returning the latest data based on the basic data and the plurality of update difference histories.

According to a fifth aspect of the present invention, in the data recovery method of the fourth computer system, the file update difference history point management area further manages any storage location information at that time. The file update difference history point management unit includes current management information indicating whether the file is a target, and after the file history point data creation unit creates the latest data, the file update difference history point management unit And updating the current management information in the file update difference history point management area so that the storage location information of the latest update difference history in the file is managed.

The data recovery method of a sixth computer system according to the present invention is the data recovery method of the fifth computer system, wherein the file history point data creating means includes: the input / output request receiving means; When receiving a request to acquire update difference data for returning the update state based on the update difference history pointed to by the storage location information related to the current management information in the management area to the immediately preceding update state, the current management information is received from the file device. Fetches the update difference history pointed to by the storage location information according to the above, creates and returns the update difference data based on the update difference history, and the file update difference history point management means, the file history point data creation means After the update difference data is created, the immediately preceding update of the update difference history related to the update difference data is performed. And updates the current management information of the file update difference history point management area to the storage location information of the difference history managed.

The data recovery method of a seventh computer system according to the present invention is the data recovery method of the sixth computer system, wherein the file history point data creating means includes: the input / output request receiving means; When receiving a request to acquire update difference data for changing the update state based on the update difference history indicated by the storage location information related to the current management information in the management area to the next update state, the current management information is received from the file device. The update difference history immediately after the update difference history according to the above is taken out, the update difference data is created and returned based on the update difference history, and the file update difference history point management means,
After the file history point data creating means creates the update difference data, the current management information in the file update difference history point management area is set so that the storage position information of the update difference history relating to the update difference data is managed. Is updated.

An eighth data recovery method for a computer system according to the present invention is the data recovery method for the seventh computer system, wherein the file history point data creating means includes: the input / output request receiving means; Is received, the basic data is taken out from the file device and returned, and the file update difference history point management means returns the storage location of the basic data after the file history point data creation means returns the basic data. The present invention is characterized in that current management information in the file update difference history point management area is updated so that the information becomes a management target.

According to a first aspect of the present invention, there is provided a data recovery method for a computer system, comprising: a file input / output request receiving step of receiving an update request for basic data, which is data to be updated, stored in a file device; A file update difference creating step for creating an update difference history as update information corresponding to the update request for the basic data received in the request receiving step, and adding the file update difference to the file device; and the update difference created in the file update difference creating step A file update difference history point management step of adding storage location information of the history in the file device to a file update difference history point management area.

In a second data recovery method for a computer system according to the present invention, in the first data recovery method for a computer system, when a request for creating new basic data is received in the input / output request receiving step, the file device is stored in the file device. A file confirmation step of creating the new basic data based on the stored basic data and the plurality of update difference histories and adding the new basic data to the file device, wherein the file update difference history point management step further comprises: The storage location information of the new basic data created in the file determination step in the file device is added to the file update difference history point management area.

A third data recovery method for a computer system according to the present invention is the data recovery method for the second computer system, wherein the file update difference history point management step includes the step of: After adding the storage location information of the data in the file device, the storage location information relating to the basic data and the plurality of update difference histories stored in the file update difference history point management area before that is added to the file update difference. Delete from the history point management area,
The file determination step is further characterized in that the basic data and the plurality of update difference histories relating to the storage location information deleted in the file update difference history point management step are deleted from the file device.

A fourth data recovery method for a computer system according to the present invention is the data recovery method for a third computer system, wherein when the input / output request receiving step receives a request for obtaining the latest data, the data is stored in the file device. And a file history point data creating step of creating and returning the latest data based on the basic data and the plurality of update difference histories.

According to a fifth aspect of the present invention, in the data recovery method of the fourth computer system, the file update difference history point management step includes the step of creating the file history point data by using the latest data in the file history point data creation step. After the creation, the storage location information of the latest update difference history among the plurality of update difference histories reflected in the latest data is stored in the file update difference history point management area with the current management information that is the management target at that time. It is characterized by doing.

According to a sixth aspect of the present invention, in the data recovery method of the fifth computer system, the file history point data creating step is performed in the input / output request receiving step. When receiving a request to acquire update difference data for returning the update state based on the update difference history pointed to by the storage location information related to the current management information in the management area to the immediately preceding update state, the current management information is received from the file device. Retrieves the update difference history pointed to by the storage location information according to the above, creates and returns the update difference data based on the update difference history, and the file update difference history point management step is performed in the file history point data creation step. After creating the update difference data, the Updating updates the current management information of the file update difference history point management area as one storage location information of the previous update difference history of the difference history is managed it, characterized in that.

A data recovery method for a computer system according to a seventh aspect of the present invention is the data recovery method for a sixth computer system, wherein the file history point data creating step is performed in the input / output request receiving step. When receiving a request to acquire update difference data for changing the update state based on the update difference history indicated by the storage location information related to the current management information in the management area to the next update state, the current management information is received from the file device. Fetching the update difference history immediately after the update difference history according to the above, creating and returning the update difference data based on the update difference history, and wherein the file update difference history point management step includes: After creating the update difference data in the step, the update difference data And updates the current management information of the file update difference history point management area as storage location information of the update difference history is managed according to the.

An eighth data recovery method for a computer system according to the present invention is the data recovery method for the seventh computer system, wherein the file history point data creating step is performed by the input / output request receiving step. Is received, the basic data is extracted from the file device and returned, and the file update difference history point management step returns the basic data in the file history point data creation step, and then stores the basic data in the storage location of the basic data. The present invention is characterized in that current management information in the file update difference history point management area is updated so that the information becomes a management target.

A first recording medium according to the present invention is characterized in that a file input / output request receiving process for receiving an update request for basic data, which is data to be updated, stored in a file device; File update difference creation processing for creating an update difference history as update information corresponding to the received update request for the basic data, and adding the file to the file device; and the file of the update difference history created in the file update difference creation processing A program for causing a computer to perform file update difference history point management processing for adding storage location information in the device to the file update difference history point management area is recorded.

A second recording medium according to the present invention, in the first recording medium, when the program further receives a request for creating new basic data in the input / output request receiving process, the program is stored in the file device. A file update process for creating the new basic data based on the basic data and the plurality of update difference histories and adding the new basic data to the file device. The storage location information of the new basic data created in the determination process in the file device is added to the file update difference history point management area.

A third recording medium according to the present invention, in the second recording medium, wherein the file update difference history point management process stores the new basic data in the file device in the file update difference history point management area. After adding the information, delete the storage location information related to the basic data and the plurality of update difference histories stored in the file update difference history point management area before that from the file update difference history point management area, The file determination process may further include deleting the basic data and the plurality of update difference histories related to the storage location information deleted in the file update difference history point management process from the file device.

In a fourth recording medium according to the present invention, in the third recording medium, when the program further receives a request for obtaining the latest data in the input / output request receiving process, the program is stored in the file device. File history point data creation processing for creating and returning the latest data based on the basic data and the plurality of update difference histories.

A fifth recording medium according to the present invention, in the fourth recording medium, wherein the file update difference history point management process creates the latest data in the file history point data creation process, The storage location information of the latest update difference history among the plurality of reflected update difference histories is the current management information which is the management target at that time in the file update difference history point management area.

A sixth recording medium according to the present invention, in the fifth recording medium, wherein the file history point data creation processing is performed in the input / output request accepting processing in accordance with the current management information in the file update difference history point management area. When receiving a request to acquire update difference data for returning the update state based on the update difference history indicated by the storage location information to the immediately preceding update state, the update indicated by the storage location information related to the current management information is received from the file device. Retrieving the difference history, creating and returning the update difference data based on the update difference history, and after the file update difference history point management process creates the update difference data in the file history point data creation process, The storage location information of the update difference history immediately before the update difference history related to the update difference data is set as a management target. And updates the current management information of the file update difference history point management area.

A seventh recording medium according to the present invention, in the sixth recording medium, wherein the file history point data creation processing is performed by adding the current management information in the file update difference history point management area in the input / output request reception processing. When receiving a request to obtain update difference data for changing the update state by the update difference history indicated by the storage location information to the next update state, one of the update difference histories related to the current management information is received from the file device. The subsequent update difference history is taken out, the update difference data is created and returned based on the update difference history, and the file update difference history point management process
After the update difference data is created in the file history point data creation process, the current management information in the file update difference history point management area so that the storage position information of the update difference history related to the update difference data is managed. Is updated.

An eighth recording medium according to the present invention, in the seventh recording medium, wherein the file history point data creation processing receives the basic data acquisition request in the input / output request reception processing. The file update difference history point management process returns the basic data in the file history point data creation process, and then stores the storage position information of the basic data as a management target. The present invention is characterized in that current management information in the file update difference history point management area is updated.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the first embodiment of the present invention comprises a computer system operated by program control, a user program 1 executed in the computer system, and a file device 8. I have.

The computer system includes a file input / output request accepting unit 11, a file update difference history point management unit 12, a file update difference creation unit 13, a file determination unit 14, a file update history data reference unit 15, a file update And history point data creation means 16.

The file input / output request receiving means 11 receives the file output request 2 issued from the user program 1.
, A file confirmation request 3, a latest data acquisition request 4,
Previous history data acquisition request 5 and next history data acquisition request 6
And the basic data acquisition request 7, and notifies the file update difference history point management unit 12.

File update difference history point management means 1
2 analyzes the input / output request notified from the file input / output request receiving unit 11 and updates the file update difference history point, and in response to the input / output request, the file update difference creation unit 13 and the file determination unit 14 , And an instruction to the file update history data reference means 15.

The file update difference creation means 13 creates update difference history data for the previously created update difference history data according to the instruction notified from the file update difference history point management means 12 and outputs it to the file device 8.

The file determination means 14 creates new basic data from the basic data stored in the file device 8 and the update difference history according to the instruction notified from the file update difference history point Output to

The file update history data reference means 15
According to the instruction notified from the file update difference history point management means 12, the necessary data among the basic data and the update difference history stored in the file device 8 is read, and the file history point data creation is performed together with the instruction on the data to be created. Hand over to means 16.

File history point data creation means 16
Creates the data requested by the user program 1 based on the data and the instruction passed to the file update history data reference means 15 and transfers the data to the user program 1.

Next, the operation of the first embodiment of the present invention will be described in detail with reference to FIGS.

Referring to FIG. 3, when an input / output request from the user program 1 occurs, the file update difference history point management area 21 managed by the file update difference history point management means 12 stores the update difference history 24. It is assumed that the update difference history 26 is currently managed and the update difference history 26 is managed as the latest update difference history at the present time.

First, the file input / output request receiving means 11
Accepts an input / output request from the user program 1.

The file input / output request receiving means 11 determines that the received input / output request is a file output request 2 if the request is a user's request to write data to a file or a request from the user program 1 to automatically save data. Then, the file update difference history point management unit 12 is notified (step A1).

File update difference history point management means 1
2 receives the notification from the file input / output request receiving means 11 and adds the file update difference history point to the file update difference history point management area 21 (step B).
1) Change the update difference history that is the current management target from the update difference history 24 to the update difference history 25, and instruct the file update difference creation unit 13 to create the update difference history 25.

The file update difference creation means 13 creates a file update difference based on the instruction of the file update difference history point management means 12 (step C 1), and writes it in the file device 8.

If the received request is a request for creating new basic data based on the basic data and the update difference history up to the present time, the file input / output request receiving means 11 determines this as a file confirmation request 3 (step A2). , The file update difference history point management unit 12 is notified.

File update difference history point management means 1
2 deletes the basic data 22 in the file update difference history point management area 21 and the management area of the update difference history 23 in response to the notification from the file input / output request receiving means 11, and replaces the update difference history 24 with the new basic data. The file update difference history point management area 21 is updated (step B2), and the file determination means 14 is instructed to create new basic data from the basic data 22, the update difference history 23, and the update difference history 24. .

The file determination means 14 creates a basic file based on the instruction of the file update difference history point management means 12 (step C2), and writes it in the file device 8.

If the received request is a data acquisition request after the last update, the file input / output request accepting means 11 determines this as the latest data acquisition request 4 (step A3), and Point management means 12
Notify.

File update difference history point management means 1
2 receives the notification from the file input / output request receiving unit 11 and updates the update difference history currently being managed in the file update difference history point management area 21 with the update difference history 2
4 to the update difference history 26 (step B3), and the basic data 22, the update difference history 23, the update difference history 24, the update difference history 25, and the update difference history 26
Is instructed to acquire the file update history data from the file device 8.

The file update history data reference means 15
The basic data 22, the update difference history 23, the update difference history 24, the update difference history 25, and the update difference history 26 are acquired from the file device 8 based on the instruction of the file update difference history point management unit 12, and the file history point data is created. Hand over to means 16.

File history point data creation means 16
Creates the latest data based on the data passed from the file update history data reference means 15 (step C3)
Pass to user program.

If the received request is a data acquisition request before changing to the current data, the file input / output request accepting means 11 determines this as the previous history data acquisition request 5 (step A4), and updates the file. The difference history point management unit 12 is notified.

File update difference history point management means 1
2 receives the notification from the file input / output request receiving unit 11 and updates the update difference history currently being managed in the file update difference history point management area 21 with the update difference history 2
4 to the update difference history 23 immediately before (step B4), and instructs the file update history data reference means 15 to acquire the update difference history 24 from the file device 8.

The file update history data reference means 15
The update difference history 24 is acquired from the file device 8 based on the instruction of the file update difference history point management means 12, and the data is passed to the file history point data creation means 16.

File history point data creation means 16
Then, based on the update information described in the update difference history 24 passed from the file update history data reference means 15,
Update difference data to be applied to the current data and changed to the immediately preceding data is created (step C4) and passed to the user program.

If the received request is a data acquisition request after changing the current data, the file input / output request accepting means 11 determines this as the next history data acquisition request 6 (step A5), and updates the file. The difference history point management unit 12 is notified.

File update difference history point management means 1
2 receives the notification from the file input / output request receiving unit 11 and updates the update difference history currently being managed in the file update difference history point management area 21 with the update difference history 2
4 to the update difference history 25 one step later (step B5), and instructs the file update history data reference means 15 to acquire the update difference history 25 from the file device 8.

The file update history data reference means 15
The update difference history 25 is acquired from the file device 8 based on the instruction of the file update difference history point management unit 12, and the data is transferred to the file history point data creation unit 16.

File history point data creation means 16
Then, based on the update information described in the update difference history 25 passed from the file update history data reference means 15,
Update difference data to be applied to the current data and changed to the next data is created (step C5) and passed to the user program.

If the received request is a data acquisition request before changing the basic data, the file input / output request receiving means 11 determines this as a basic data acquisition request 7 (step A6), and The point management means 12 is notified.

File update difference history point management means 1
2 receives the notification from the file input / output request receiving unit 11 and updates the update difference history currently being managed in the file update difference history point management area 21 with the update difference history 2
4 to the basic data 22 (step B6), and instructs the file update history data reference means 15 to acquire the basic data 22 from the file device 8.

The file update history data reference means 15
The basic data 22 is acquired from the file device 8 based on the instruction of the file update difference history point management means 12 (step C6), and the data is passed to the file history point data creation means 16.

File history point data creation means 16
Then, the basic data 22 passed from the file update history data reference means 15 is passed to the user program.

With the above, the operation of the first embodiment of the present invention is completed.

According to the first embodiment of the present invention, the data update information by the user program is sequentially stored in the file device in the form of the difference, and the data is transferred to the user program in the form of the difference. Therefore, since the history of data update can be reproduced on the user program, if a failure occurs in the computer system while data is being input by the user program, the data input process can be reproduced after restarting the computer system. This has the effect that the user can grasp the restart point of the data input operation by the user program.

[0066]

Next, the operation of an embodiment of the present invention will be described in detail with reference to FIG.

For example, it is assumed that the document creation program has created the document shown on the left side of FIG. 4, and “Aioo” is stored as basic data 31 in the file device. In this document creation program, the document shown on the left side of FIG. 4 is automatically saved in units of one line.

When the document writing program requests the file output request 2 when the user has written “Kaki”, the file input / output request receiving means 11 sends the file update difference history point management means 12 to the file update difference history point managing means 12. Notify the request.

File update difference history point management means 1
2 adds an area for managing an update difference history relating to “Kaki”, which is a difference between data changes, to the file update difference history point management area 21, and
Is instructed to create an update difference history related to “Oyster”.

The file update difference history creation means 13
An update difference history 32 is created together with information that “Kaki” is added to the position next to “Aueo” and output to the file device 8. The file update difference history creation means 13
In the same manner, the update difference history 33 and the update difference history 34
Create

After the update difference history 34 is created, an abnormality occurs in the computer system while the user is inputting “tachi”, and after the computer system is restarted, the document being created by the document creation program is used. The continuation of is created.

When the document creation program requests the latest data acquisition request 4 after activation, the file input / output request receiving means 11 notifies the file update difference history point management means 12 of the request from the document creation program.

File update difference history point management means 1
2 changes the target update difference history in the file update difference history point management area 21 to the update difference history 34,
The basic data 31 is stored in the file update history data reference unit 15.
And an instruction to acquire the update difference history 32, the update difference history 33, and the update difference history 34.

The file update history data reference means 15
The data designated by the file update difference history point management means 12 is acquired and passed to the file history point data creation means 16.

File history point data creation means 16
Creates the latest data from the basic data 31, the update difference history 32, the update difference history 33, and the update difference history 34 passed to the file update history data reference means 15, and passes them to the document creation program.

At this time, the user has included the latest document up to “Sashisushi Seso” and entered “Tatsu”
If you know exactly what to do from,
The user continues to input the next document from "Tachi", but if it is not possible to correctly recognize what is included in the latest document and what should be input, the previous history data acquisition request 5
Request.

The file input / output request receiving means 11 notifies the file update difference history point managing means 12 of a request from the document creation program.

File update difference history point management means 1
2 changes the target update difference history in the file update difference history point management area 21 to the update difference history 33,
The update difference history 3 is stored in the file update history data reference means 15.
4 is obtained.

The file update history data reference means 15
The data designated by the file update difference history point management means 12 is acquired and passed to the file history point data creation means 16.

File history point data creation means 16
Creates update difference data for deleting the last "Sashisusesoso" of the current document based on the update difference history 34 passed to the file update history data reference means 15 and transfers the data to the document creation program.

The document creation program deletes and displays "Sashisusesoso" at the end of the document based on the update difference data passed from the file history point data creation means 16.

The user repeats the previous history acquisition request 5, grasps the process of document creation, and continues document creation.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the second embodiment of the present invention includes, in addition to the first embodiment, a recording medium 17 for recording a program for causing a computer system to execute the above-described processing. .

The program is read into the computer system from the recording medium 17 and controls the operation of the computer system. Under the control of the program, the computer system executes the processing by the computer system according to the first embodiment, that is, the file input / output request receiving unit 11, the file update difference history point management unit 12, the file update difference creation unit 13, the file determination unit 14, the same processing as the file update history data reference means 15 and the file history point data creation means 16 is executed.

Thus, the processing of the second embodiment is completed.

[0087]

As described above, according to the present invention, after a failure occurs in a computer system, the data input process by the user program which was being input at the time of the failure was reproduced while reproducing the data during the input. In addition to the effect that the user program can be recovered, there is an effect that the user can grasp the restart point of the data input processing by the user program.

[Brief description of the drawings]

FIG. 1 is a block diagram showing first and second embodiments of the present invention.

FIG. 2 shows a file input / output request receiving unit 11, a file update difference history point management unit 12, and a file update difference creation unit 1 according to the first and second embodiments of the present invention.
3 is a flowchart showing the processing of file determination means 14, file update history data reference means 15, and file history point data creation means 16.

FIG. 3 is a diagram showing the contents of a file update difference history point management area 21 in the first and second embodiments of the present invention.

FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 user program 8 file device 11 file input / output request accepting means 12 file update difference history point management means 13 file update difference creation means 14 file determination means 15 file update history data reference means 16 file history point data creation means 17 storage medium 21 File update difference history point management area 22 Basic data 23 to 26 Update difference history 31 Basic data 32 to 34 Update difference history

Claims (24)

[Claims] A file device for storing basic data that is data to be updated and a plurality of update difference histories that are update information for the basic data; and a file device for storing the basic data and the plurality of update difference histories. A file update difference history point management area for storing storage location information, a file input / output request receiving unit for receiving an update request for the basic data, and an update request for the basic data received by the file input / output request receiving unit. File update difference creation means for creating the update difference history to be added to the file device, and storing the storage location information of the update difference history created by the file update difference creation device in the file device, the file update difference history File update difference history point to be added to the point management area Data recovery system of the computer system, characterized in that a physical means. 2. When the input / output request receiving unit receives a request to create new basic data, the input / output request receiving unit stores the new basic data based on the basic data stored in the file device and the plurality of update difference histories. File updating means for creating and adding to the file device, the file update difference history point managing means further stores storage location information of the new basic data created by the file determining means in the file device, 2. The data recovery method according to claim 1, wherein the data is added to an update difference history point management area. 3. The file update difference history point management unit adds the storage location information of the new basic data in the file device to the file update difference history point management area before the file update difference history point management unit. The storage location information related to the basic data and the plurality of update difference histories stored in a management area is deleted from the file update difference history point management area, and the file determination unit is configured to execute the file update difference history point management unit. 3. The data recovery method for a computer system according to claim 2, wherein the basic data relating to the deleted storage location information and the plurality of update difference histories are deleted from the file device. 4. When the input / output request receiving unit receives a request for acquiring the latest data, the input / output request receiving unit creates the latest data based on the basic data stored in the file device and the plurality of update difference histories. 4. A data recovery method for a computer system according to claim 3, further comprising a file history point data creating means for returning the file history point data. 5. The file update difference history point management area further includes current management information indicating which storage location information is to be managed at that time, wherein the file update difference history point management means includes: After the file history point data creation means creates the latest data, the file update difference history is managed so that the storage position information of the latest update difference history among the plurality of update difference histories reflected in the latest data is managed. 5. The data recovery method according to claim 4, wherein the current management information in the point management area is updated. 6. The file history point data creating means, wherein the input / output request receiving means sets one update state based on update difference history indicated by storage location information relating to current management information in the file update difference history point management area. When receiving a request to acquire update difference data for returning to the previous update state, the update difference history pointed to by the storage location information related to the current management information is extracted from the file device, and the update difference history is determined based on the update difference history. Creating and returning data, the file update difference history point management means, after the file history point data creation means creates the update difference data, updates the update difference history immediately before the update difference history related to the update difference data The current management information in the file update difference history point management area is set so that the storage position information of the difference history is managed. Claim, characterized in that the new five
The data recovery method of the computer system as described. 7. The file history point data creating means, wherein the input / output request accepting means determines one update state based on the update difference history indicated by the storage location information of the current management information in the file update difference history point management area. When receiving a request to acquire update difference data for setting a later update state, the next update difference history of the update difference history relating to the current management information is extracted from the file device, and based on the update difference history. Creating and returning the update difference data, wherein the file update difference history point management means stores the update difference history according to the update difference data after the file history point data creation means creates the update difference data. Updating the current management information in the file update difference history point management area so that the information is managed. Data recovery system of the computer system according to claim 6. 8. The file update point history generating means, wherein when the input / output request receiving means receives the basic data acquisition request, the file history point data generating means retrieves the basic data from the file device and returns the basic data. Point management means updates the current management information in the file update difference history point management area so that the storage location information of the basic data is managed after the file history point data creation means returns the basic data. The data recovery method of a computer system according to claim 7, wherein the data recovery method is performed. 9. A file input / output request receiving step of receiving an update request for basic data that is data to be updated stored in a file device, and an update request for the basic data received in the file input / output request receiving step File update difference creation step of creating an update difference history as update information corresponding to the file device and adding the update difference history to the file device, and updating the storage location information of the update difference history created in the file update difference creation process in the file device A file update difference history point management step of adding to a difference history point management area. 10. When a request for creating new basic data is received in the input / output request receiving step, the new basic data is stored on the basis of the basic data stored in the file device and the plurality of update difference histories. A file update step of creating and adding the file to the file device, wherein the file update difference history point management step further updates the storage location information of the new basic data created in the file determination step in the file device. 10. The data recovery method for a computer system according to claim 9, wherein the data is added to a difference history point management area. 11. The file update difference history point management step, wherein the storage location information of the new basic data in the file device is added to the file update difference history point management area before the file update difference history point management area. The storage location information related to the basic data and the plurality of update difference histories stored in a management area is deleted from the file update difference history point management area, and the file determination step further includes the file update difference history point management. 11. The data recovery method for a computer system according to claim 10, wherein the basic data relating to the storage location information deleted in the step and the plurality of update difference histories are deleted from the file device. 12. When the latest data acquisition request is received in the input / output request receiving step, the latest data is created based on the basic data stored in the file device and the plurality of update difference histories. 12. The data recovery method for a computer system according to claim 11, further comprising a step of creating file history point data to be returned. 13. The file update difference history point management step, wherein after the latest data is created in the file history point data creation step, the latest update difference history of a plurality of update difference histories reflected in the latest data. 13. The data recovery method for a computer system according to claim 12, wherein the storage position information of the computer system is set as current management information to be managed at that time in the file update difference history point management area. 14. The file history point data creating step includes, in the input / output request receiving step, one update state based on an update difference history pointed to by storage location information of current management information in the file update difference history point management area. When receiving a request to acquire update difference data for returning to the previous update state, the update difference history pointed to by the storage location information related to the current management information is extracted from the file device, and the update difference history is determined based on the update difference history. Creating and returning the data, the file update difference history point management step, after creating the update difference data in the file history point data creation step, updating the update difference history of the update difference history related to the update difference data The file update difference history point is set so that the storage location information of the difference history is managed. Data recovery method of claim 13, wherein the computer system and updates the current management information collected by the management area. 15. The file history point data creating step, wherein in the input / output request receiving step, one update state based on an update difference history pointed to by storage location information related to current management information in the file update difference history point management area. When receiving a request to acquire update difference data for setting a later update state, the next update difference history of the update difference history relating to the current management information is extracted from the file device, and based on the update difference history. After the update difference data is created and returned, the file update difference history point management step creates the update difference data in the file history point data creation step, and then stores the update difference history relating to the update difference data. The file update difference history point management area Data recovery method of claim 14, wherein the computer system and updates the management information. 16. When the file history point data creation step receives the basic data acquisition request in the input / output request reception step, the basic data is taken out from the file device and returned, and the file update difference history After returning the basic data in the file history point data creation step, the point management step updates the current management information in the file update difference history point management area so that the storage position information of the basic data is managed. The method according to claim 15, wherein the data is recovered. 17. A file input / output request receiving process for receiving an update request for basic data, which is data to be updated, stored in a file device, and an update request for the basic data received in the file input / output request receiving process. File update difference creation processing for creating an update difference history as update information corresponding to the file device and adding the file update difference history to the file device; and updating the storage location information of the update difference history created in the file update difference creation process in the file device for file update. A recording medium on which a program for causing a computer to perform a file update difference history point management process to be added to a difference history point management area is recorded. 18. The program, when receiving a request to create new basic data in the input / output request receiving process, based on the basic data stored in the file device and the plurality of update difference histories. The file update difference history point management process further includes storing the new basic data created in the file confirmation process in the file device. 18. The recording medium according to claim 17, wherein position information is added to the file update difference history point management area. 19. The file update difference history point management process, after adding storage location information of the new basic data in the file device to the file update difference history point management area, and before that. The storage location information relating to the basic data and the plurality of update difference histories stored in a management area is deleted from the file update difference history point management area, and the file confirmation processing further includes the file update difference history point management. 2. The file system according to claim 1, wherein the basic data relating to the storage location information deleted in the processing and the plurality of update difference histories are deleted from the file device.
8. The recording medium according to 8. 20. When the program further receives a request for obtaining the latest data in the input / output request receiving process, the program is further configured on the basis of the basic data stored in the file device and the plurality of update difference histories. 20. The recording medium according to claim 19, further comprising a file history point data creation process for creating and returning the latest data. 21. After the file update difference history point management process creates the latest data in the file history point data creation process, the latest update difference history of a plurality of update difference histories reflected in the latest data. 21. The recording medium according to claim 20, wherein the storage location information is current management information to be managed at that time in the file update difference history point management area. 22. The file history point data creation process, wherein in the input / output request reception process, one update state based on the update difference history pointed to by storage location information relating to current management information in the file update difference history point management area. When receiving a request to acquire update difference data for returning to the previous update state, the update difference history pointed to by the storage location information related to the current management information is extracted from the file device, and the update difference history is determined based on the update difference history. Creating and returning data, after the file update difference history point management process creates the update difference data in the file history point data creation process, updates the immediately preceding update difference history related to the update difference data In the file update difference history point management area, the storage location information of the difference history is managed. Recording medium according to claim 21, wherein updating the resident management information. 23. The file history point data creation process, wherein in the input / output request reception process, one update status based on the update difference history indicated by the storage location information of the current management information in the file update difference history point management area. When receiving a request to acquire update difference data for setting a later update state, the next update difference history of the update difference history relating to the current management information is extracted from the file device, and based on the update difference history. After creating and returning the update difference data, after the file update difference history point management process creates the update difference data in the file history point data creation process, the storage location of the update difference history related to the update difference data Update the current management information in the file update difference history point management area so that the information becomes the management target Recording medium according to claim 22, wherein Rukoto. 24. When the file history point data creation processing receives the basic data acquisition request in the input / output request reception processing, the basic data is taken out from the file device and returned, and the file update difference history After the point management process returns the basic data in the file history point data creation process, the current management information in the file update difference history point management area is updated so that the storage position information of the basic data is managed. The recording medium according to claim 23, wherein: