JPS63143640A - Data control system - Google Patents

Abstract

PURPOSE:To effectively utilize the source of a data file by detecting an unused area in each data file, contracting data file size, transferring data files successively in the unused area, and writing information relating to the transferred data file in a directory part. CONSTITUTION:When a data file to be contracted exists, a file processing means 10 reads out information relating to the data file to be contracted from the directory part 2. The means 10 recognizes idle areas between the data files and unused areas in respective data file and determines the contraction of the data file size and an area to which the data file is to be put close on the basis of said recognition. Consequently, idle areas 5, 7 and unused areas 3b, 4b, 6b, 8b in respective data files are removed, an unused area in the rear end part of a file volume is expanded and data files G, 9 which can not be stored before file contraction processing can be stored.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data management method for efficiently storing data by removing unnecessary vacant areas in a file volume.

[Prior art] Fig. 3 shows, for example, “MELCOM 0860/UMX
Operating System Manual (QM-8ROO
-79A <54AO> )”, page 25, and “M
ELCOM 0860/UMX Utility・
Program manual (QM-8ROO-67A<53AO
This is an explanatory diagram showing the conventional data management method shown on page 200 of ">)". In the figure, (1a) is the file volume before file compression processing, and (1b) is the file volume after file compression processing is completed. , and (2) is a directory section provided within this file volume that holds information regarding data files, which will be described later. (3) is a data file A stored within the file volume, and ( 3a) is this data file A
The used area (3) and (3b) are also unused areas. (4), (6) and (8) are similar data files B
, D and F, (4a), (6a) and (8a) are their used areas, and (4b), (6b) and (8b) are their unused areas. (5) and (7) are empty areas left after deleted data files C and E.
Normally, the data of the data files C and E before deletion remains in this part, and in the deletion process, only the information regarding the data files C and E in the directory part (2) is deleted. (9) is the data file G newly stored in this file volume. (lO) is a file processing means that performs file compression processing to remove empty areas, etc., in order to improve the data storage efficiency of the file volume having such a configuration.

Next, the operation will be explained. FIG. 4 is a flowchart for explaining the operation. File processing means (1
0), when the file compression process starts, it is first detected in step STI whether or not there is any data file left to be compressed. If there is no data file left, the process is terminated, and only if there is left, the process is started. is moved to step ST2. In step ST2, information regarding the detected data file to be compressed is read from the directory section (2), and in step ST4, the data file is transferred based on the read information and is moved forward. Next, the information regarding the forward-loaded data file is written in the directory section (2) in step ST5, and the process returns to step STI.

This process is repeated until there are no more data files to compress.

Through such file compression processing by the file processing means (10), empty areas (5) and (7) are removed, and the file volume changes from the state shown at 1a in FIG. 3 to 1b in the same figure.
The state shown in is reached, and the rear end of the file volume is
The unused area has been expanded and the data file G (9
) can be stored.

[Problems to be Solved by the Invention] Since the conventional data management system is configured as described above, the empty space (5) in the file volume.

(7) is removed, but no processing is performed on the unused area (3b) of the data file (3), etc. Therefore, if the amount of data in the data file does not increase, the unused area (3b) etc. ), etc., remain empty forever, resulting in file areas being wasted and the resources of data files being unable to be used effectively.

This invention was made to solve the above-mentioned problems, and is a data management method that can efficiently store data by reducing the data area that is wasted in a file volume. The purpose is to obtain.

[Means for Solving the Problems] The data management method according to the present invention detects an unused area in a data file, reduces the size of the data file, and sequentially transfers the data file. This is to write information regarding the data file to be stored in the directory section Z.

[Operation] The data management method of the present invention detects unused areas within each data file, reduces the size of the data file, and sequentially transfers the data files to this area, thereby reducing the amount of space within the file volume. To efficiently store data by reducing wastefully secured data areas and expanding unused areas at the rear end of file volumes.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, (la) and (1b) are file volumes before file compression processing and after file compression processing is completed, (2) is a directory part, and (3) is a file volume.

(4), (6), and (8) are data files A, B, and D.

F, (3a), (4a), (6a), (8a) are their usage areas, (3b), (4b), (6b), (
8b) is the unused area, (5) and (7) are empty areas, (9) is the data file G to be newly stored, (10)
is a file processing means, and these are equivalent to those given the same reference numerals in FIG.

Next, the operation will be explained. FIG. 2 is a flowchart for explaining the operation. File processing means (1
0), as in the conventional case, when file compression processing is started, first, in step ST1, it is detected whether or not there remains a data file to be compressed. If there is a data file to be compressed, the process moves to step ST2, and information regarding the detected data file to be compressed is read from the directory section (2). Next, step ST3
In this step, empty areas between data files and unused areas within each data file are recognized, and based on this recognition, it is determined to reduce the data file size and to which area the data files should be moved forward. When the area to be moved forward is determined, the data file is reduced and transferred in step ST4, and the area is moved forward. Next, in step ST5, the information regarding the forward-packed data file is written in the directory section (2), and the process is continued in step S.
Return to TI. This process is repeated until there are no more data files to compress.

Such file compression processing by the file processing means (10) results in empty areas (5), (7) and unused areas (3b), (4b) in each data file.

(6b) and (8b) are removed, so the file volume changes from the state shown at 1a in Figure 1 to the state shown at 1b in the same figure, and the unused area at the rear end of the file volume is expanded, Data file G(9), which could not be stored before file compression processing, can now be stored.

Note that in the above embodiment, file compression processing is also performed on the empty areas between data files, but no processing is performed on the empty areas between data files, and only unused areas within the data files are removed. You can simply reduce the size of the data file by using

Furthermore, in the above embodiment, a case has been described in which data files are transferred in advance and information about the data files is written to the directory section after the transfer process. The writing process to the directory section may be performed before the file transfer process, and the same effect as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, the unused area in the file between each data file is detected, the data file size is reduced and the data files are sequentially transferred there, and the transferred data is Since the configuration is configured to write information about files to the directory section, the data area that was wasted in the file volume is reduced, the unused area at the end of the file volume is expanded, and data file resources are This has the effect of making effective use of.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a data management system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining its operation, FIG. 3 is an explanatory diagram showing a conventional data management system, and FIG.
The figure is a flowchart for explaining the operation. (1a) and (1b) are file volumes before and after file compression processing, (2) are directory parts, (
3), (4), (6) and (8) are data files (3)
a), (4a), (6a) and (8a) are their usage areas, (3b), (4b), (6b) and (8
b) is those unused areas, and (10) is the file processing means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others) Figure 1 10: File processing 6 results Figure 2

Claims (1)

[Claims] In a data management method in which a directory section for holding information about data files is provided in a file volume and the data files stored in the file volume are managed, an unused area in the data file is detected and the unused area is detected. A data management method characterized in that the data files are sequentially transferred to the area, and information regarding the data files to be transferred to the unused area is written in the directory section.