JPH0566976A - Master file managing system - Google Patents

Abstract

PURPOSE:To reduce the capacity of a master file by eliminating the same key and sampling required information even after the deletion of the master file by executing a check in the case of updation while utilizing a checking master having the management data of the master file. CONSTITUTION:The checking master 5 has the management data of the master file and when the master file 2 is deleted, the required data in the master file 2 and a deletion flag are registered to the checking master 5. In the case of updation to the master file 2 by an updation module 1, while referring to the master management data part of the checking master 5, it is judged whether the updation processing to the master file 2 can be executed or not. When the updation can be executed according to these master file management data, the data part of the master file 2 is updated and the master file management data part of the checking master 5 is updated, as well. Thus, even after the unrequired records of the master file 2 are deleted, the same key can be eliminated and the required data can be retrieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master file management system for reducing the file size of a master file in an information processing system.

[0002]

2. Description of the Related Art Conventionally, a master file has all the necessary information on one record, and even if most of the information on the record is no longer needed after a certain processing, the same key is excluded. To display some necessary information (such as status flag) when searching,
It is customary to leave the record in the master file.

[0003]

In the above-mentioned conventional master file management system, when one record length in the master file is large and a large number of records are generated, the master file becomes huge in capacity, and the external storage device becomes large. Has a disadvantage that it becomes unnecessarily large and that it takes a long time to perform a process of searching for a record on the master file and a process of storing the master file in another medium (magnetic disk or magnetic tape).

[0004]

According to the master file management method of the present invention, a check master having management data of a master file is used to perform a check at the time of updating to eliminate the same key even after the master file is deleted. And collecting required information to reduce the size of the master file.

Further, in the master file management method of the present invention, a check master file is prepared separately from the master file, and for a record for which a certain process has been completed, only the items showing the characteristics of the record are extracted and the check is performed. Created as one record on the master file for use, delete the record from the master file,
It is configured to reduce the size of the master file.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a file format.

When the update module 1 updates the master file 2, the master management data section of the check master 5 is referred to, and it is determined whether the update processing can be executed for the master file 2.

When it can be determined that the update of the master file 2 can be performed by the master file management data of the check master 5, the data part of the master file 2 and the master file management data part of the check master 5 are updated. To do. For example, when performing the deletion process for the key “0001”, the key part “000
1 ”, the master file management data section is referred to determine whether the deletion process can be executed, and if the deletion process is possible, the record of the key part“ 0001 ”of the master file 2 is deleted and the key of the check master 5 is deleted. The information deleted in the master file management data section of the record of the section "0001" and the data necessary for reference are registered in the check master 5.

Next, the search module 4 sends the key "000
When issuing the search processing command of "2", the master file management data part of the key "0002" of the check master 5 is referred to, and the contents of the master file management data part of the key "0002" of the master file 2 are stored in the master file 2. If the contents indicate that the master file 2 exists, the master file 2 is searched and the data part of the key “0002” of the master file 2 is passed to the search module 4. Also, check master 5
If the key "0002" indicates that the master file 2 has been deleted, the search module 4 checks the master 5
Pass the master file management data of.

[0011]

As described above, according to the present invention, when deleting a record in which most of the information on the record is no longer needed after a certain process is completed, only the data necessary for the check master is registered and the master is used. By managing the files, the disadvantages of deleting the master file (such as deleting the same key and displaying records at the time of searching) cannot be eliminated, the master file capacity can be reduced, and the search processing of records on the master file can be performed. This has the effect of shortening the time required to store the master file in another medium (magnetic disk or magnetic tape).

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a file format.

[Explanation of symbols]

 1 Update module 2 Master file 4 Search module 5 Check master

Claims (2)

[Claims] 1. A master file having a management data of a master file is used to perform the check at the time of updating, thereby eliminating the same key and collecting necessary information even after the master file is deleted, and the capacity of the master file. A master file management method characterized by reducing 2. A check master file is prepared separately from the master file, and for a record for which a certain process has been completed, only the items showing the characteristics of the record are extracted and created as one record on the check master file. The master file management method according to claim 1, wherein the record is deleted from the master file to reduce the capacity of the master file.