JPH0318944A - File control method - Google Patents

Abstract

PURPOSE:To reduce the storing capacity of a file and to shorten the storing/ restoring time of the file by adding an updating date to a block forming the file and storing only those blocks that are updated on and after the designated storing date. CONSTITUTION:The updating date is set for each updating to the blocks forming a file. When a storing date is fixed at a time point T0, for example, a total storing operation is performed at the time point T0. Then only the blocks that are updated between the time points T0 and T1 are stored when the files are stored at the time point T1. Only the blocks that are updated between the time points T0 and T2 are stored when the files are stored at the time point T2. Then only the blocks that are updated between the time point T0 and T3 are stored when the files are stored at the time point T3 respectively. Thus only the limited blocks are stored in a file store state and therefore the storing capacity and the storing/restoring time of files are reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a file management method, and in particular, to a file management method suitable for use when saving a file having a block structure with an update date and time. Regarding the method.

(Prior Art) In general, when performing file management, especially when storing files, each block of a file does not have information such as update date and time, so file users cannot
As shown in the explanatory diagram of the conventional file management method in the figure, when a block is updated from time To and the file is saved at time T1 after a certain period of time has elapsed, time T. It was necessary to save both the updated block at that point and the unupdated block at that point, that is, the entire block.

(Problem to be solved by the invention) Conventional file management was performed as described above, so it is necessary to save both updated blocks and unupdated blocks, which reduces the amount of file storage and the cost of saving/restoring. There is a problem in that the time required to manage large-capacity files becomes so long that it cannot be ignored.

The present invention has been made in view of the above, and its purpose is to:
By giving the update date and time to the blocks that make up a file, and allowing the user to set the save date and time arbitrarily, the storage range of the file can be updated arbitrarily, and the storage amount of the file can be changed.
An object of the present invention is to provide a file management method that makes it possible to reduce save/restore time.

[Structure of the invention]

(Means for Solving the Problems) In the file management method of the present invention, when updating a block-structured file having an update date and time, the update date and time are set in the updated block, and the update date and time are arbitrarily specified when saving the file. It is configured such that only blocks with updated dates and times after this date and time are to be saved.

(Function) By assigning the update date and time to the blocks that make up the file, allowing the user to arbitrarily specify the save date and time when saving the file, and only blocks that have been updated after the specified save date and time being saved. , it is possible to arbitrarily set the storage range, thereby reducing the storage amount and storage/restore time when updating files.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 are explanatory diagrams of a file management method according to an embodiment of the present invention. FIG. 1 shows the concept of saving only updated blocks when the save date is fixed at time To, and FIG. Figure 2 shows the concept of saving only updated blocks when a save date is specified arbitrarily.

Now, the user first starts at the first time point T. The entire file is saved, and at this time, the date and time when the entire file was saved is set in the file information management area. On the other hand, an update date and time is set for each block that constitutes a file each time it is updated. This update date and time is the time T when the file is saved,
, T2. At T3, it is compared with the save date and time specified by the user, and the specified save date and time and the entire save date and time are saved in a save file.

Now, when restoring only updated blocks, only the saved blocks are restored. At this time, the save date and time on the save file is set only to the save date of the update block in the file information management area.

Before restoring, in order to prevent logical destruction of the file, make sure that the file information management area and the save file's entire save date match, and that the save date and time of only the updated block is saved file > file information management area. is checked.

Based on the above concept, if the current save date is fixed at time To, as shown in Figure 1, the entire file will be saved at time To, and when saving the file at time TI, data from time T to time T+ will be saved. Only updated blocks are saved, at time T
When saving the file in step 2, only the updated blocks from time T 1 to time T2 are saved, and when saving the file at time T3, the updated blocks from time T 2 to time T3 are saved.

On the other hand, if the storage date and time is specified arbitrarily, as shown in FIG. Then, the entire file is saved, and when the file at time T is saved, the file is saved at time T. Only the updated blocks from time T1 to time T1 are saved; when saving the file at time T2, only the updated blocks from time Tt to time T2 are saved; when saving the file at time T3, the updated blocks from time T to time T3 are saved. Saved.

With the above file management method, the user can set the save date and time arbitrarily, and only a limited number of blocks are saved when saving the file, reducing the amount of storage and save/restore time. .

〔Effect of the invention〕

According to the file management method of the present invention, the file user can arbitrarily change the storage range by specifying the storage date and time, so it is possible to save only updated blocks based on the update date and time. This can significantly reduce the amount of files saved and the time it takes to save/restore.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a file management method according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional file management method.

Claims (1)

[Claims] When updating a file with a block structure that has an update date and time, the update date and time is set for the updated block, and when saving the file, only blocks that have an update date and time after the arbitrarily specified date and time are saved. file management method.