Data processing: database and file management or data structures – Database design – Data structure types
Patent
1996-11-12
1998-05-26
Kulik, Paul V.
Data processing: database and file management or data structures
Database design
Data structure types
707 2, 707102, G06F 1730
Patent
active
057583331
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a data management system using a database with central control and data modules.
2. Description of the Related Art
In a real-time system, in particular a switching system, large volumes of data, that are to some extent complexly interrelated, have to be managed. These data must be accessed in real time, i.e. as quickly and reliably (in other words, consistently) as possible.
In European patent document EP-A2-042522 there is described a database management system with a data dictionary, the application and the database management system being separate from one another to the extent that their communication takes place via the operating system (using I/O interrupts) and the data managed by the database management system being stored on disk. This separation is very disadvantageous with regard to the request for real-time capability.
In the case of previously known switching systems, the various user systems are themselves responsible for the data modules, types of addressing and access procedures. This has the result that in each user system there are individual ways of implementing identical functions. In addition, the lack of a uniform structure makes it difficult to maintain an overview and to support external object-oriented accesses (CMISE).
Until now, data consistency has likewise been ensured at the user level. This has the consequence of a coarse granularity with respect to access control. Furthermore, the methods of ensuring consistency restrict system availability. In addition, the ensuring of consistency is made more difficult by the possibility of direct data access. For example, as a result access conflicts can be identified only with difficulty.
SUMMARY OF THE INVENTION
The present invention is based on the object of providing a data management system which relieves the user of access control tasks and data maintenance tasks and which is nevertheless flexible with respect to user-individual forms of the user data.
This and other objects and advantages of the present invention are achieved by a data management system having control system and at least one generic data module, control system and controls accesses to user data on a central level, generic data module, and which controls accesses to user data on a local level, the local access control system thereby cooperating correspondingly with the central access control system, data module being produced by defining user-specific data types from a generic data module, and with respect to a user system, and which represents the only interface of a user system to the data management system.
The (central and local) access control system has the effect that a user system of the data management system is relieved of access control tasks (for example controlling data consistency in access sequences), controlling access conflicts in the case of parallel accesses by a plurality of users) and, as a result, increases the availability of the user system correspondingly.
The exclusive communication by the user with the data management system via access procedures which are exported from the data management system has the effect of ensuring good data encapsulation with respect to the user. As a result, it is easier to identify access conflicts, which are likewise handled by the access control system.
Finally, the indirect data access has the effect of freeing the user to the greatest extent of data management functions.
By instantiation or instancing of the generic modules, i.e. by defining user-specific data types and parameters for them, it is made possible in a simple way to produce from the generic modules application-specific data modules (user modules) which are guaranteed to operate error-free with respect to the complex functionality (for example with respect to ensuring data consistency), since the instantiation or instancing has the effect that the entire functionality of the underlying generic module is automatically taken over.
Since identical fu
REFERENCES:
patent: 5555409 (1996-09-01), Leenstra, Sr. et al.
patent: 5584026 (1996-12-01), Knudsen et al.
patent: 5594899 (1997-01-01), Knudsen et al.
Bauer Astrid
Mohr Gunther
Siegwart Bernd
Kulik Paul V.
Siemens Aktiengesellschaft
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