JPS63301336A - Storing system for data managing information - Google Patents

Abstract

PURPOSE:To avoid the occurrence of omissions and conflicts of the managing information caused by the shift/deletion of a data set, by storing the start and end addresses, the protection state and the statistic information into a data set table of a VTOC of a DASD volume. CONSTITUTION:A data set is stored in a DASD volume which contains a VTOC. The VTOC includes a data set control table DSCB. This DSCB contains the data set name and the start/end addresses. Then the control information on a protection state, a producer, the replacement frequency, etc., are stored into a track right before the track which is shown by the start address of the DSCB. When a data access request is given from a user, an OS adds -1 to the start address in the DSCB to read the managing information and to check the access right of the user and informs the results of these jobs to a user program. Thus it is possible to avoid the occurrence of omissions and conflicts of the managing information caused by the shift/deletion of the data set.

Description

[Detailed description of the invention] 〔overview〕 The information that currently manages datasets is the catalog.

VTOC,RA CF (Resource Access
ss Control Facility) etc. Each piece of information is stored in separate management records, and some of the same information is managed twice. Therefore, when deleting or moving a dataset, it is necessary to also delete the management information at the same time. Inadequacies in methods and procedures often resulted in missing or inconsistent management information.

In order to solve these problems, we centrally managed the management information of the data set as part of the data set, so that there would be no loss or inconsistency in the management information due to the movement or deletion of data centers.

[Industrial application field]

The present invention relates to a data management information storage method in which management information such as the protection status of a data center, statistical information, and space information is stored in a DASD volume as part of the data center data.

[Conventional technology]

FIG. 5 is a diagram showing a conventional management form of data set management information. A volume in which a data set is stored has a VTOC, and the data set creation date, expiration date, reference date, update flag, protection status, space information, etc. are written in this VTOCO. VTOC
protection status means password protection, RACF protection, etc.
It indicates the type of protection provided. In the RACF management book, the data center's registration date, reference date, protection status, etc. are entered. The protection status of the RACF management book means that the general public is only allowed to read the data set, or that User A is allowed to read and write the data set. . The catalog also contains the data set's registration date, update date, expiration date, creator, etc.

[Problem to be solved]

In conventional management formats, the same information is managed using multiple management records. Therefore, when moving or deleting a dataset, it is necessary to also move the management information at the same time, but due to deficiencies in the migration method or procedures, missing or inconsistent management information can occur.

The present invention was created in view of this point, and by centrally managing the management information of a dataset as a part of the dataset, missing or inconsistent management information due to the movement or deletion of the dataset can be avoided. The purpose is to prevent this from happening.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention. Enter the start address and end address of the data section of the data set in the data set control table DSCB of the VTOC of the DASD volume. Then, the protection status and statistical information of the data set are stored between the address obtained by -n of the start address and the start address. The start address and end address are physical addresses expressed in CCHH.

〔Example〕

FIG. 2 is a diagram showing an example of a storage method of data management information according to the present invention. Data sets are stored on DASD volumes. A VTOC exists in a DASD volume, and a DS CB (Dataset
Control (old ock) exists. DSCBI points to the data section. Management information such as protection status and statistical information is stored in the track immediately before the track indicated by the start address of this DSCB. This protection status means the protection status entered in the conventional RACF management register, and statistical information includes the registration date, reference date,
Contains information such as creator and number of uses. Only the space allocation status is stored in the VTOC, and only the volume serial number of the DASD volume in which the data set exists is stored in the catalog. This management information will be specially managed using system access methods, etc., and will not be readable by general users.

FIG. 3 is a diagram showing the relationship between the DSCB, the management section, and the data section. The data set name, start address, and end address are written in the DSCB.

The start address and end address are expressed as CCHH,
The beginning and end of the data section are shown respectively. As described above, management information such as the protection status (password), creator, and number of updates is stored in the track immediately before the track indicated by the start address of the DSCB. For example, if the starting address of the data section is 5-10, the management information will be written from 5-9. The management information of the management unit is accessed by O8.

FIG. 4 is a diagram illustrating data access processing. When a user issues a data access request, the O8
-1 the start address in the CB, read the management information, and check the user's access rights. NG if the user's access rights preclude the access request.
is issued to abnormally terminate the user program, and if it is OK, it notifies the user program of OK.

When OK is received, the user program accesses data within the range of start and end addresses. When the user finishes accessing the data, the user notifies the OS of the completion. Upon receiving the termination notification, the O8 updates the statistical information in the management information.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, (a) the management book migration tool that was conventionally necessary becomes unnecessary;

(b) The problem of inconsistency in management records due to deletion and migration of data centers will be eliminated.

(C) Since there is no concentration of access to the management book, this method is more advantageous in terms of performance than the conventional technology.

It is possible to achieve remarkable effects such as:

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an example of the storage method of data management information of the present invention, FIG. 3 is a diagram showing the relationship between the DSCB, the management section, and the data section, and FIG. FIG. 5, which is a diagram showing data access processing, is a diagram showing a conventional management form of data set management information.

Claims (1)

[Scope of Claims] Enter the start address and end address of the data part of the data set in the data set control table (DSCB) of the VTOC of the DASD volume, and write the start address and end address of the data part of the data set, and write the start address and end address of the data part of the data set, and write the address between -n of the start address and the start address. A data management information storage method characterized in that the protection status and statistical information of the data set are stored.