JPH04287140A - File managing system for dividing into plural physical files - Google Patents

Abstract

PURPOSE:To prevent a data from being missed and processing speed from being lowered by dividing one logical file into plural physical files and distributing them to plural volumes. CONSTITUTION:This system is composed of a file generation part 1, record addition part 2, record retrieval part 3, file exclusion part 4, file management part 5, file management information file 6 and file control information file 7. One logical file is generated and in the case of additionally writing a record, the one generated logical file is divided into the plural physical files corresponding to the number of records to be added. Further the plural divided physical files are allocated to the plural volumes, the one generated logical file is made correspondent to the plural physical files and in the system of retrieving the record of the one logical file, the records corresponding to the plural divided physical files are retrieved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to additional writing of records, and relates to a management method for dividing one logical file into multiple physical files, a management method for allocating the divided multiple physical files to multiple volumes, and a generated system. The present invention relates to a management method for associating one logical file with a plurality of divided physical files, and a management method for searching for corresponding records of a plurality of divided physical files in a format that searches records of one logical file.

0002

[Prior Art] Conventionally, this type of management system has been used to generate a logical file and write additional records, since a logical file is created as a physical file on a single volume. It was only possible to add records up to the maximum capacity of the generated volume. Furthermore, since one generated logical file becomes one physical file, if additional writing and searching need to be performed simultaneously, the processing speed will be greatly affected.

0003

[Problem to be Solved by the Invention] In the conventional management method described above, when one logical file is generated and additional records are written, one logical file is created as one physical file on a single volume. , it was not possible to add records up to the maximum capacity of the volume. Therefore, there is a drawback that data may be lost due to volume capacity limitations during additional writing. Furthermore, since one generated logical file becomes one physical file, there is a drawback that the processing speed becomes slow if additional writing and searching need to be performed simultaneously.

0004

[Means for Solving the Problems] The file management method of the present invention generates one logical file, and when writing additional records, divides the generated logical file into multiple physical files according to the number of added records. means and
A method for allocating a physical file divided into multiple volumes to multiple volumes, a means for associating one generated logical file with the multiple divided physical files, and corresponding records of the multiple physical files divided in a format that searches records of one logical file. and a means for searching.

[0005]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, which includes a file generation section 1, a record addition section 2, a record search section 3, a file deletion section 4, a file management section 5, a file management information file 6, and a file control information file. Consists of 7.

FIG. 2 shows the basic flow of operation.

[0008] Based on the configuration of the target system, a file management information file is used to store records for storing information on volumes on which files can be generated, the number of records to be allocated to one file, and correspondence information between generated files and divided files. Generate as.

[0009] When starting up the system, the file management section expands the file management information file as a table on memory.

[0010] When generating a file, the user requests the file generation unit to generate the file. The file generation unit updates file management information and generates a file control information file and a request file.

[0011] When adding a record, the user requests the record addition unit to add the record.

[0012] When adding records, if the maximum number of records in one file is reached, the file management section requests the file management section to divide the file. The file management unit updates file management information and generates a file control information file and a request file.

[0013] When searching for a record, the user requests the record search unit to perform a search.

[0014] When deleting a file, the user requests the file deletion unit to delete it. The file deletion unit deletes the request file and the file control information file, and clears the file management information.

[0015]

[Effects of the Invention] As explained above, the present invention divides one logical file into multiple physical files and distributes them to multiple volumes without the user of the file being aware of it.
Even when it is necessary to search for a logical file that is being additionally written, the impact can be reduced because the access is actually to one of the multiple divided files. Furthermore, since the limit on the number of records to be added can be extended to all volumes in the system, there is an effect that the possibility of interruption due to capacity overflow during record addition is reduced.

[Brief explanation of the drawing]

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

FIG. 2 shows the basic flow of operation.

FIG. 3 shows a record layout of a file management information file.

FIG. 4 shows a record layout of a file control information file.

[Code explanation]

1 File generation section 2 Record addition section 3 Record search section 4 File deletion section 5 File management department 6 File management information file 7 File control information file

Claims (1)

[Claims] Claim 1: When one logical file is generated and additional records are written, a means for dividing the generated one logical file into a plurality of physical files according to the number of added records, and a method for dividing the generated one logical file into a plurality of physical files, A file that has means for allocating it to a volume, means for associating one generated logical file with multiple divided physical files, and means for searching for corresponding records in multiple divided physical files in a format that searches for records in one logical file. Management method.