JPH03228149A - Data managing method - Google Patents

Abstract

PURPOSE:To easily restore index information even when a magnetic disk is destroyed by recording generation information indicating the contents of the used index information to a DRAW type storage medium every time the index information is housed in a reloadable storage medium. CONSTITUTION:When managing data stored in the DRAW type storage medium, every time the index information is housed in the reloadable storing medium, the generation information indicating the contents of the index information is housed in the DRAW type storage medium, and a history indicating the process of a change in the index information is left. Therefore, the information according to the index information is housed in the DRAW type storage medium. Thus, when the index information housed in the reloadable storing medium is destroyed, the generation information housed in the reloadable storing medium is successively read out and the index information can be restored.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data management method for managing data stored in a write-once storage medium.

(Prior Art) In recent years, with the development of various storage media, there are increasing opportunities to store and preserve various types of storage data, such as document data converted into image data, on these storage media. Generally, write-once storage media such as optical disks are widely used as storage media for storing data for preservation. Electronic filing devices are used to store data for preservation using such write-once storage media.

FIG. 2 shows a block diagram of a general electronic filing device.

As shown in the figure, the electronic filing device 1 includes a controller 2, a magnetic disk device 3 connected to the controller 2, an optical disk device 4, a printer 5, a system console 6, a line controller 7°8, and an image scanner 11. It is configured.

The controller 2 is composed of a processor and the like that controls and manages each part constituting the electronic filing device 1. The magnetic disk device 3 stores various data (eg, index information) using a rewritable storage medium, such as a hard disk or a floppy disk. The optical disc device 4 stores various data (for example, document data) using an optical disc, which is a write-once storage medium. The printer 5 prints various information. The system console 6 is an operating device that includes a display 6a for displaying information and a keyboard 6b for inputting information. The line control unit 7 is for signal matching with the communication line (public network) 9. Similarly, the line control unit 8
N (Local Area Network) l
This is to achieve signal matching with O. The image scanner 11 reads a document in the form of image data.

In the electronic filing device 1 having the above configuration, the optical disk device 4 stores document data input using the system console 6 or image scanner 11, and document data received from the communication line 9 or LAN 10. . Data management methods for managing document data stored in this optical disk device 4 can be broadly classified into two types.

One method is to store both document data and index information used when accessing this document data in the optical disk device 4 (first data management method). The other one is to store the document data in the optical disk device 4, while
This is a method of storing in the magnetic disk device 3 index information used when accessing document data stored in the optical disk device 4 (second data management method).

Here, these two methods will be explained with reference to FIGS. 3 and 4.

FIG. 3 is an explanatory diagram of the first conventional data management method.

In the figure, an optical disk 4a mounted on an optical disk device 4 is shown.
A data layout diagram is shown.

In the figure, the optical disc 4a is provided with two areas: an index information area 20 and a document data area 21. The index information area 20 contains a plurality of pieces of index information, that is, the index information 20
a, 20b, and 20c are stored. Further, the document data area 21 contains a plurality of document data, that is, the document data 21
a, 21b.

21c is stored.

Index information 20a, 20b, 20c is document data 21a
, 21b, and 21c in one-to-one correspondence. In the case of the index information 20a, the index information consists of information such as a document name that specifies the document data 21a, a storage position on the document data area 2I, and the amount of data. By recognizing this index information 20a, the document data area 2
The position and amount of the document data 21a on the document data 21a can be grasped, and the document data 21a can be read out as needed.

Further, by simply searching the index information area 20, it is possible to understand what kind of document data is stored in the document data area 21.

When index information is stored on the optical disc 4a as described above, when additional writing is performed due to a change in document data, the index information is also added accordingly.

Next, FIG. 4 shows an explanatory diagram of the second conventional data management method.

The figure shows a magnetic disk 3a loaded in the magnetic disk device 3 and an optical disk 4a loaded in the optical disk device 4.

The magnetic disk 3a is provided with an index information area 22 for storing a plurality of pieces of index information.

Further, the optical disc 4a is provided with a document data area 21 for storing a plurality of document data.

The index information area 22 includes three pieces of index information 22a, 22b.
, 22c are stored. In addition, three document data 21a, 21b, 21 are also stored in the document data area 21.
Assume that c is stored.

In this case, when additional writing is performed on the document data area 21 due to document registration, updating, etc., the following processing is performed. First, an area necessary for additional writing is secured on the document data area 21. Then, additional document data is sequentially added from the top position of this secured area, and the contents of the index information area 22 are also changed along with this additional writing. That is, if this additional writing is the registration of new document data, index information is newly generated. This index information consists of information indicating the storage position of the document data, that is, the start address of the previously secured area, and the amount of document data. Furthermore, if the additional information is due to updating of document data, etc., the content of the corresponding index information already stored in the index information area 22 is changed. That is, information indicating the new storage location and amount of document data, etc. will be changed.

(Problems to be Solved by the Invention) Now, in the first data management method, that is, in storing index information on the optical disc 4a, the following problems have occurred.

In general, the access speed of a write-once storage medium such as the optical disk 48 is very slow, and this has caused the problem that it is difficult to quickly access index information that needs to be frequently referenced and modified.

Furthermore, when index information is stored in a rewritable storage medium such as the magnetic disk 38, the access speed is high, so the index information can be accessed quickly. However, when using the optical disk 4a with a different electronic filing system 1, the magnetic disk 3a must be carried.
In general, magnetic disks 3a, especially floppy disks, may be physically damaged or their contents may be destroyed due to magnetic influence, and they are exposed to such dangers when being carried. and -dan magnetic disk 3a
If the contents of the optical disc 4a are destroyed, a problem arises in that the contents of the optical disc 4a cannot be read out again.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a data management method that allows index information to be easily restored even if a magnetic disk is destroyed.

(Means for Solving the Problems) A data management method of the present invention stores index information in a rewritable storage medium while accumulating data in a write-once storage medium, and Data is configured to be accessed using the index information stored in the rewritable storage medium, and each time the index information is stored in the rewritable storage medium, the contents of the index information used at that time. Generated information indicating the information is recorded on the write-once storage medium.

(Operation) In the above method, each time index information is stored in a rewritable storage medium, generated information indicating the content of this index information is stored in the write-once storage medium, and a history indicating the process of change of the index information is stored. Therefore, information based on the index information is stored in the write-once storage medium. If the index information stored in the rewritable storage medium is destroyed, the generated information stored in the write-once storage medium is sequentially read out to restore the index information.

(Example) The present invention is based on the electronic filing device 1 shown in FIG.
This can be realized using a magnetic disk device 3 and an optical disk device 4. Therefore, the present invention will be explained here by illustrating only the portions related to the magnetic disk device 3 and the optical disk device 4.

FIG. 1 shows an explanatory diagram of the data management method of the present invention.

The figure shows a magnetic disk 3a loaded in the magnetic disk device 3 and an optical disk 4a loaded in the optical disk device 4.

The magnetic disk 3a is provided with an index information area 22 for storing a plurality of pieces of index information and a log address area 24 indicating the beginning position of a free area in a log information area 23, which will be described later. Further, the optical disc 4a is provided with a document data area 21 and a log information area 23 for storing a plurality of document data.

The index information area 22 includes three pieces of index information 22a, 22b.
, 22c are stored. In addition, three document data 21a, 21b, 21 are also stored in the document data area 21.
Assume that c is stored.

Index information 22a, 22b, 22c is document data 21a
, 21b, and 21c in one-to-one correspondence. In the case of the index information 22a, the index information consists of a document name that specifies the document data 21a, a storage position on the document data area 21, the amount of data, and the like. By recognizing this index information 22a, the document data area 2
1, the location and data amount of the document data 21a on the document data 21a can be grasped, and the document data 21a can be read out as necessary. Further, by simply searching the index information area 22, it is possible to understand what kind of document data is stored in the document data area 21.

Now, when additional writing is performed on the document data area 21 due to document registration, updating, etc., the following processing is performed. First, an area necessary for additional writing is secured on the document data area 21. Then, additional document data is sequentially added from the top position of this secured area, and the contents of the index information area 22 are also changed along with this additional writing. That is, if this addition is the registration of a new document, index information is newly generated. This index information consists of the storage position of the document data, that is, the start address of the previously secured area, the amount of document data, and the like.

Furthermore, if the addition is due to updating the document, the content of the corresponding index information already stored in the index information area 22 is changed, that is, the information indicating the new storage location of the document data, data amount, etc. is changed. It turns out.

The contents of the index information area 22 and the document data area 21 are the same as those of the conventional one described above with reference to FIG.

Now, the log information area 23 is an area for storing generated information indicating the contents of the index information written in the index information area 22, that is, log information indicating the history of changes. For example, if we focus on the index information 22a in the index information area 22, we can find out the history of generating this index information 22a, that is, the name that specifies the document data, the amount of data, and where in the document data area 21 this document data was stored. This information includes information such as storage location indicating the index information 22a, processing information indicating processing such as updating and deleting the index information 22a, and the like. Specifically, the index information 22
When a is newly created, log information (generated information) is composed of processing information indicating the new creation process and information such as the name and data amount.

Also, if the index information 22a is deleted,
Log information (generated information) is configured from processing information indicating deletion processing. This is not limited to the index information 22a, but the history of all index information on the index information area 22 is added.

To explain specifically the procedure for adding this log, log information related to access to the index information area 22 is generated.This log information is used to create, change, delete, etc. the index information as explained above. By referring to this log information, it is possible to recognize what kind of access was executed to the index information area 22.

Next, the head position of the empty area in the log information area 23 is recognized by reading the log address area 24 of the magnetic disk 3a. Then, log information is written to a predetermined position in the log information area 23 based on the contents of the log address area 24. Finally, the contents of the log address area 24 are changed to indicate the starting position of the new free area, and the process ends.

Next, a case will be described in which index information is constructed using the log information area 23 constructed as described above.

For example, if the magnetic disk 3a is completely destroyed, the log information area 23 is read out sequentially from the beginning position. New creation, modification, deletion, etc. of index information is executed in sequence according to the contents. In this way, by sequentially reading the log information area 23, the index information can be restored to the current (latest) content according to its history.

Note that if the magnetic disk 3a that stores index information indicating the current state of the optical disk 4a is destroyed,
Assume that there is a magnetic disk 3a that stores index information that does not show the current (latest) state of the optical disk 4a but shows its past state. Log information area 2 after the content indicated by the log address area 24 of this magnetic disk 3a
By reading only 3, the current state of the optical disk 4a can be easily constructed on the magnetic disk 3a showing this past state. In this case, the index information can be restored more quickly than when the log information area 23 is read from the beginning.

The present invention is not limited to the above embodiments.

In the embodiment, the write-once storage device was explained using an optical disk as an example, but the storage device is not particularly limited and may be any write-once type. Also, a magnetic disk device may be a floppy disk device. There is no limitation, and any rewritable storage device may be used, and the data stored in the write-once storage device is not limited to document data.

(Effects of the Invention) The data management method of the present invention described above stores generation information (log information) indicating contents for which index information can be constructed in a write-once storage medium for storing data, Even if a rewritable medium storing information is destroyed, it can be easily restored.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the data management method of the present invention, FIG. 2 is a block diagram of a general electronic filing device, FIG. 3 is an explanatory diagram of the first conventional data management method, and FIG. 4 is a diagram of the conventional data management method. FIG. 3 is an explanatory diagram of a second data management method. 3a... Magnetic disk, 4a... Optical disk, 21
...Document data area, 22... Index information area, 23
...Log information area, 24...Log address area. Fig. 2 An explanatory diagram of the conventional data management method Fig. 3 An explanatory diagram of the second data management method Fig. 4

Claims (1)

[Claims] While data is stored in a write-once storage medium, index information is stored in a rewritable storage medium, and the data accumulated in the write-once storage medium is stored in the rewritable storage medium. The index information is configured to be accessed using the index information, and each time the index information is stored in the rewritable storage medium, generated information indicating the contents of the index information used at that time is stored in the write-once storage medium. A data management method characterized by recording.