JPS61178788A - Document file retrieving system - Google Patents

Abstract

PURPOSE:To enable document numbers to be known from a key word at about the same speed as heretofore without using sub-memory by sucking retrieval information on a main memory after mounting the optical disk on a drive. CONSTITUTION:A retrieval information area 13 is a part in which the retrieval information concerning the first to N-th informations written in a document information area 11 is written. When the number N of the document is L-times (L=1, 2, 3,...) of a predetermined value M (for example, M=1,000), that is, N=L.M, retrieval information concerning the first to N-th information is supplemented. When the optical disk used as document file disk is set on an optical disk deck 15, the deck 15 is controlled by means of a document file interface part 18 to read the most recent retrieval information written in the retrieval information area of the disk and load it on the main memory 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a document file search method capable of searching for documents written on a write-once optical disk or the like without using an auxiliary storage device such as a floppy disk.

Conventional technology When using a write-once optical disc as a document file, the writing area of the optical disc is conventionally divided into a document information area 1 and a document management information area 2, as shown in FIG. 5, and writing is performed in the document information area 1. However, the document management information shown in FIG. 2 was written in the document management information area 2, and the document was searched based on the management information in the document management information area 2.

However, the document management information written in the document management information area 2 in this case has keywords 1 to Kn for each document as shown in FIG. The need to check management information was inefficient.

Therefore, when a large number of documents are written on an optical disk, a search device 3 shown in FIG. 7 is installed separately from the optical disk device.
has been established. This search device 3 receives keywords sent from a host device 4 at a host interface section 5, and a control section 6 controls an auxiliary storage interface section 7 based on the output of this host interface section 6 to store an auxiliary storage device such as a floppy disk. 8, the document number corresponding to the keyword is searched for and returned to the host device 4. L. If a new document is added to the document information area 1 of the optical disc, this Correspondingly, the control section 6 adds the index information of the new document to the index information stored in the auxiliary storage device 8 and reads the index information here.

Problems to be Solved by the Invention In recent years, there has been a strong demand to reduce the cost of document file systems that utilize optical disks. Furthermore, when a 70-speed disk is used as an auxiliary storage device, there is the hassle of using bare optical disks and floppy disks. For this reason, there was a strong demand to search for document numbers based on keywords using only optical discs without using auxiliary storage devices, but since management information cannot be rewritten on write-once optical discs, this has not been possible with conventional technology. I couldn't do that.

Means for Solving the Problems In order to quickly solve the problems of the conventional art, the present invention divides the storage area of an optical disc into a document information area, a document management information area, and an index information area, and adds a new information to the document information area. When writing a document, document management information corresponding to this new document is created and written in the document management information area, and the number of document information is a multiple of the predetermined value M (L=1.
2. ...) Each time new index information is written, new index information is created and written in the index information area, and when performing a document search, if the document information to be searched is document information before the L/Mth document information, the above The document information area is searched based on the latest index information written in the index information area, and if the document information to be searched is document information after the L/Mth document information, it is written in the document management information area. The present invention is characterized in that the document information area is searched based on the latest index information stored in the document management information area and the Lth and Mth document management information written in the document management information area.

Operation By using the above means, when searching for the L document, search information for documents before the L and Mth documents can be obtained from the index information area of the optical disk, and search information for documents after the L and Mth documents can be obtained from the document on the optical disk. Since the index information can be obtained from the management information area, the document number can be found from the keyword at almost the same speed as before without having to download the index information onto the main memory after mounting the optical disc in the drive and using an auxiliary storage device.

Embodiment FIG. 1 shows the format of a document file showing an embodiment of the document file search method according to the present invention. As shown in this figure, this document file is stored in storage area 1 of the optical disc.
0 is divided into a document information area 11, a document management information area 12, and an index information area 13.

The document information area 11 is an area where document contents are written.
- Each document is numbered (document number) in the order of its entry.

Further, the document management information area 12 includes the document information area 1
All the documents written in 1, that is, the 1st to Nth document management information respectively corresponding to the 1st to Nth document information are written. It has multiple keywords as shown in the format of Figure 2.

The index information area 13 is a part where index information for the first to Nth document information written in the document information area 11 is written, and L and the number N of documents are a predetermined value M. (For example, M=10oo) times L (L is 1.
2, 3, -) At time tD, that is, when lN=LM, index information for the first to Nth document information is added in the format shown in FIG. Therefore, for example M
If L=1000 and the number of document information written in the document information area 11 is 3000, index information for the first to 3000th document information is added to the index information area 13. After this, when the number of document information written in the document information area 11 reaches 4000 and 6000, the first to fourth document information are written in the index information area 13 respectively.
Index information for 000 document information, 1st to 50th oO
Index information for the document information is sequentially added.

FIG. 4 is a circuit block diagram showing an example of a search device used in this embodiment. The search device 14 shown in this figure is
Based on the information read from the optical disk deck 16,
When a keyword is supplied from the host device 16, the document number or document information corresponding to this keyword is sent to the host device 16. , and a main memory 2o.

Here, the control section 19 operates as described below.

First, when an optical disc used as a document file disc is set on the optical disc deck 16,
The optical disk deck 16 is controlled via the document file interface section 18, and the index information area 1 of the optical disk is controlled.
The latest index information written in 3 is read out and loaded into the main memory 2o. Therefore, if the number of document information registered in the document information area 11 is 300.5, then
The index information for the document information of O is loaded into the main memory 20, and the number of document information in the document information area 11 is 498.
If it is 9, the first to
Index information for the 4000th document information is loaded into the main memory 2o. Next, the control unit 19 controls document management information for documents that are not included in the latest index information in the index information area 13 among all the registered document information, that is, if the total number of document information is 3006, the 3001st to 3005th document management information is loaded into the main memory 20. After this, the control section 19
is the 300th document management information from the 3001st to 3005th document management information.
Create index information for 1st to 3005th document information,
When the host device 16 sends a keyword, the document number is searched based on this index information and the index information for the first to 3000th document information, and this is sent from the host interface section 17 to the host device 16.
- Search the document information area 11 based on the document number, read out the corresponding document information, and send it to the host device 16.

Further, when registering a document, the control unit 19 receives new document information from the host device 16, adds it to the document information area 11, creates document management information for this additional document information, and creates document management information in the document management information area. 12, and create index information for this document management information, and store this in the main memory 2o. As a result, an index information table for the first to 3006th document information is created in the L/main memory 20. In this case, the document information to be added is 3006
Since it is the index information area 13, the index information in the index information area 13 does not change.

Thereafter, the above-described registration operation is repeated and new documents are registered one by one. When the 4000th document, the document that is a multiple of a predetermined value M, is registered, the control unit 19 then registers the main memory 2o. 1st to 30th oO stored in
Index information for the document information of 3001st to 4000th
The index information for all the registered documents is created by merging the index information for all the document information, and the index information is supplied to the optical disk deck 15 to be added to the index information area 13 of the optical disk. Since the index information for all or the main parts of a registered document is written on the optical disk, the system can be started up more quickly than if all the document management information was read by key code and index information was created. can. Furthermore, since index information is created and added for each predetermined value, the index information area 13 can be made smaller than when index information is created and added each time a document is registered.

Detailed Description of the Invention As described in detail, this invention makes it possible to quickly search for documents based on keywords using just a write-once optical disc without using an auxiliary storage device, thereby reducing the cost of document file systems using optical discs. Furthermore, even in this case, the number of documents that can be registered on the optical disc can be prevented from decreasing too much.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the format of a document file showing an embodiment of the present invention, Fig. 2 is a diagram showing an example of the format of document management information in this embodiment, and Fig. 3 is a diagram showing an example of the format of document management information in this embodiment. FIG. 4 is a block diagram showing an example of a search device used in this embodiment. FIG. 5 is a diagram showing an example of the format of an optical disc in a conventional document file system. FIG. 6 is a diagram showing an example of the format of document management information written in the document management information area shown in FIG. 6, and FIG. 7 is a block diagram showing an example of a search device used in a conventional document file system. information area. Figure 2 1Pf4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] The storage area is divided into a document information area, a document management information area, and an index information area, and when writing a new document in the document information area, document management information corresponding to this new document is created and written in the document management information area. At the same time as writing, each time the number of already written document information reaches a multiple of the predetermined number M (L=1, 2,...), new index information is created and the index information is updated. When writing in the area and performing a document search, if the document information to be searched is L/Mth document information or earlier, the document information area is searched based on the latest index information written in the index information area. , if the searched document information is document information after the L/Mth document information, the document information area is searched based on the document management information after the L/Mth information written in the document management information area. A document file search method characterized by: