JPH05151089A - System for data guarantee in memory space - Google Patents

Abstract

PURPOSE:To obtain the system for the data guarantee in the memory space which enables the sharing and exclusive processing of memory data in in-job processing and can guarantees volatile data even in the memory space for high-speed processing by a computer system. CONSTITUTION:This system consists of a control part 2 for interface control between a user and a memory and a definition part for a data space and the definition part for the data space is equipped with a memory table handler 1 which is divided into a master part 3 as a data main body part and a work part 4 accessed from the user; and a control table wherein user information is registered is provided in the data space, which is divided into blocks of constant size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data guarantee system in a memory space, and in particular, in a memory space for high speed processing in a computer system, data sharing and exclusive processing in a job process and guarantee of volatile data. The present invention relates to a data security system in a memory space capable of performing.

[0002]

2. Description of the Related Art The conventional technology provides only sharing of a memory space by a plurality of processes, and the exclusive control is the responsibility of the user, and there is no unified method as a system.

Also in terms of volatility, it is still the responsibility of the user regarding the guarantee of data contents, and there has been no unified method as a system.

Due to the above two restrictions, the data which is conventionally positioned as the permanent data in the memory is mainly the service of reference only, and the updating process of the data contents is basically stored as a file on a normal disk. The method of updating the data before the memory expansion is used.

[0005]

However, in the above-mentioned conventional example, since the nonvolatile data is served only under the control of the conventional file (data) management method, the buffer pool or the like is possible. However, it is impossible to realize appropriate control as a data space for high-speed processing, and it is difficult to guarantee data.

Regarding the shared data on the memory,
Since there is no unified system for sharing data from multiple processes and exclusive control of shared data, it is complicated to share and exclude data in logical units used by users. There is also a problem that the control must be performed by the user side, and that it can be performed only in a local small space between the required processes.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to improve the inconvenience of the conventional example, and in particular, enable sharing and exclusive processing of memory data in a job process in a memory space for high speed processing in a computer system. It is to provide a data guarantee system in a memory space capable of guaranteeing data of volatile data.

[0008]

In view of the above, the present invention comprises a control unit for controlling the interface between a user and a memory and a data space definition unit, and the data space definition unit is the main unit of data. It has a memory table handler that is divided into a master part and a work part that can be accessed by users, and also has a management table in which user information is registered in the data space, and the data space is divided into blocks of a certain size. The configuration is adopted. This aims to achieve the above-mentioned object.

[0009]

[Operation] When the user passes the action code, the user information and the request table name list to the control unit of the memory table handler and declares the use of the table, the control unit of the memory table handler registers the user information in the management table. Then, exclusive control is started. Then, the control unit of the memory table handler checks the access prohibition flag to confirm that the access is not prohibited, and transfers the data from the master unit to the work unit. Furthermore, the control unit of the memory table handler notifies the user of the base address of the work unit when these procedures are completed. The user is
The table is handled for the work part, and when a series of handling is completed, the action code, user information and request table name list are passed to the control part of the memory table handler to declare the end of table use. Upon receiving the termination request, the control unit of the memory table handler compares the master unit and the work unit on a page-by-page basis, outputs the updated portion to the backup file while referring to the bitmap, and sets the critical flag of the corresponding table. Furthermore, the control unit of the memory table handler transfers the updated area from the work unit to the master unit while referring to the bitmap, and deletes the user information from the management table when these procedures are completed. Clears the critical flag of the table and ends exclusive control.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment of FIG. 1, the memory table handler is composed of a control unit for controlling the interface between the user and the memory and a defining unit for defining the data space. Here, the definition part is further divided into a master part 3 and a work part 4. The master part 3 is a main body part of data, whereas the work part 4 is a part that a user can access, that is, handle.

Here, as shown in FIG. 1, the control unit 2 defines a table group consisting of four 4 MB tables defined by EX (External Section).
Type 2 large segment table definition SLM and EX
4M defined in (External Section)
It is composed of a type 3 large segment table definition SLM composed of four B tables.

Further, as shown in FIG. 1, the master unit 3 is defined by BS (Based Section) 4
Type 2 large segment table group consisting of 8 MB tables and EX (External Section)
And a type 2 small segment table group consisting of n (n ≦ 30) 64 kB tables defined in 1.

As shown in FIG. 1, the work unit 4 is defined by BS (Based Section) 4
Type 3 large segment table group consisting of 4 MB tables and EX (External Section)
And a type 3 small segment table group composed of m tables (m ≦ 20) each having a size of 64 kB. Here, each work unit 4 is designated by the user by passing a pointer.

Further, the present invention takes the following means in order to completely realize the memory space as the data space as one system.

.. For sharing and exclusion of data space, a work area is provided as an area that can be shared only by processes within a job, and for exclusion control, user information is registered in units of tables on management information data. By providing the table area, general VSAM (Virtual Storage Acc)
Exclusion processing at the time of reference and update similar to that provided by the ess Method) function is performed.

This relieves the user from complicated exclusive control processing.

Here, VSAM is a file access method called a virtual memory access method, which is based on a dynamic index organization by a B-tree, and virtualizes and integrates conventional file organization methods such as sequential organization and direct organization. It has been modified to improve performance.

.. Regarding the problem of guaranteeing the volatility of the data space, a method of sweeping the data to a high-speed access medium such as an electronic disk device at the end of the access process is adopted. In particular, in the present invention, the data space is, for example, 20 kB or 8 kB. By dividing into blocks of a fixed size, output to a high-speed access medium is performed only in the block in which the data was actually updated.

In this embodiment, the data space as described above is set to 1
About 128MB can be used per process.

Next, the operation of this embodiment will be described with reference to FIG.

(1). When the user of the memory handler wants to use the memory table, it declares the table use start. At this time, the action code, user information, and request table name list are passed as information to the control unit of the memory table handler.

(2). When receiving the above request, the control unit of the memory table handler registers the user information in the management table and starts exclusive control.

(3). The control unit of the memory table handler checks the access prohibition flag to confirm that the access is not prohibited.

(4). The control unit of the memory table handler transfers data from the master unit to the work unit. For example, as shown in FIG. 1, the table required from the master unit of the type 2 large segment table group is transferred to the work unit of the type 3 large segment table group. Further, the table required from the master unit of the mold 2 small segment table group is transferred to the work unit of the mold 3 small segment table group.

(5). The control unit of the memory table handler notifies the user of the base address of the work unit when the procedures (2) to (4) are completed.

(6). The user performs table handling on the work section.

(7). The user declares the end of table usage when a series of handling is completed. At this time, the action code, user information, and request table name list are also passed as information to the control unit of the memory table handler.

(8). When receiving the above termination request, the control unit of the memory table handler compares the master unit and the work unit page by page, writes the updated portion in the backup file while referring to the bitmap, and sets the critical flag of the corresponding table.

(9). Further, the control unit of the memory table handler transfers the updated area from the work unit to the master unit while referring to the bitmap.

(10). The control unit of the memory table handler deletes the user information from the management table when the procedures (8) to (9) are completed.

(11). The control unit of the memory table handler clears the critical flag of the corresponding table.

(12). Exclusive control ends.

[0034]

Since the present invention is constructed and functions as described above, according to this, the user can share the data space and the shared data in the process in the job by the simple request information of the use start declaration and the use end declaration. The exclusive data security system in the memory space that enables exclusive control of the data and guarantees the volatile data, which enables the data reference and update processing to be performed at high speed and safely. Can be provided.

[Brief description of drawings]

FIG. 1 is a structural diagram of a memory table handler according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a usage image of the memory table handler of FIG.

[Explanation of symbols]

 1 memory table handler 2 control unit 3 master unit 4 work unit

Claims (3)

[Claims] 1. A data security system for a memory space in a computer system, comprising: a control unit for controlling an interface between a user and a memory; and a data space definition unit, and the data space definition unit is a data body unit. 2. A data guarantee system in a memory space, comprising a memory table handler which is divided into a master section which is the above and a work section which can be accessed by a user. 2. The data guarantee in the memory space according to claim 1, further comprising a management table in which user information is registered in the data space, and the data space is divided into blocks of a fixed size. system. 3. A control unit of the memory table handler operates according to a table use start declaration of an operator, registers user information in a management table, starts exclusive control, and checks an access prohibition flag. If it is confirmed that the access is not prohibited by the operation, the master unit has a function of transferring data from the master unit to the work unit, and when the operator declares that the table is used after the base address of the work unit is output to the operator, the master unit and the work unit are declared. The copy is compared page by page, the updated part is output to the backup file while referring to the bitmap, the critical flag of the relevant table is set, and the area that has been updated from the work part to the master part is referenced while referring to the bitmap. User information in the management table 2. The data guarantee system in a memory space according to claim 1, wherein the data guarantee system functions to end the exclusive control by further deleting and clearing the critical flag of the corresponding table.