JPS63143643A - Control system for preserving data - Google Patents

Abstract

PURPOSE:To utilize usefully and efficiently data capacity by periodically checking the contents of a label set up and described in a temporary file and automatically deleting data elapsed the permitted storing days or time. CONSTITUTION:When a file 1 is temporary, the titled system reads out the contents of a column 3c describing days necessary for storage on the basis of the current date to check whether the days required for storage have elapsed or not while observing the current date (access time). When the days required for storage have elapsed, the file 1 is immediately deleted and ended, but when the date does not elapsed yet, the contents of a description column 3d for the maximum unused period and a description area 3e for the latest using date are read out and whether the current date exceeds the maximum unusing period or not is checked on the basis of the latest using date. When the date does not elapsed yet, the file 1 is stored as it is, but the date has elapsed, the file 1 is deleted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data storage management system, particularly a data storage management system that eliminates waste and enables effective data utilization for devices having a certain data capacity. Regarding the system.

[Background of the invention]

In general, there are two types of data files: permanent files and temporary files, depending on the data content, but even temporary files will actually maintain their saved state unless they are intentionally deleted. Because it is troublesome to search for and delete such files, temporary files that are no longer needed are also saved along with the permanent files, resulting in an unorganized file.

[Purpose of the invention]

Therefore, the present invention has been made by focusing on the above-mentioned conventional situation, and solves such problems by checking temporary files according to the frequency of use and the passage of time.
The purpose is to provide a data storage management system that makes it easy to organize data by automatically deleting it, and makes it possible to effectively utilize a fixed amount of data without wasting it. There is.

[Means for solving the problem] In order to achieve this purpose, the data storage management system according to the present invention periodically checks the contents of the label set in the temporary file, It is characterized by automatically deleting data that has passed the date and time it should be saved or the time that it should be saved.

[Effect]

By using the data storage management system described above, temporary files that are old and no longer needed are automatically deleted, freeing up space and making it possible to use the area effectively without wasting it. It will become.

〔Example〕

Next, an example of the implementation of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is a conceptual diagram showing the structure of a file l used in the data storage management system according to the present invention. A label portion 3 is formed thereon. The label section 3 includes, in order, a file name field 3a, a field 3b for writing whether the file is temporary or permanent, a field 3C for writing the required storage date and time, and a field 3d for writing the maximum unused period.
, the most recently used date and time column 3e, and when this file 1 is accessed, the data in the most recently used date and time column 3e is always changed to the accessed date and time.

FIG. 2 is a flowchart showing a data storage management system based on the file 1 described above. First, a process is performed to check the contents of the label section 3 of file 1, and it is determined whether the file 1 is temporary or not. , a check is made to see if it is permanent. Here, if the file l is permanent, it cannot be deleted and the process ends, but if it is temporary, check the current date and time (at the time of access) and use that current date and time as the standard. Date and time required for storage wA3
C is read to check whether the required storage date and time has passed. If the required storage date and time has passed, the file l will be deleted immediately and the process will end. However, if the required storage date and time has not yet passed, the maximum unused period will be entered in column 3d. Reading column 3e for the most recent use date and time, the current date and time is checked to see if the maximum unused period has passed from the most recently used date and time, and if it has not been used yet, it will be stored as is, but if it is not. In this case, the file 1 is deleted and the process ends.

Note that the process control in the above-described flowchart is performed by a CPU connected to a timer, and the timer is supposed to execute the contents of this flowchart every preset fixed period.

〔Effect of the invention〕

As described above, according to the data storage management system of the present invention, temporary files that are used infrequently and become old after a certain period of time are automatically deleted, so the area on the storage device is This allows for effective use without waste, and helps to organize unnecessary information.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the structure of a file used in a data storage management system according to the present invention, and FIG. 2 is a flowchart of the same. 1...File 3...Label Department Patent Applicant Representative of Alps Electric Co., Ltd. Manentha a-
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Claims (2)

[Claims] (1) A data storage management system that periodically checks the contents of a label set in a temporary file and automatically deletes data whose storage date and time have passed. (2) A data storage management system characterized in that the periodic checking of the label contents is performed using a timer.