Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
1999-02-19
2001-09-11
Choules, Jack (Department: 2177)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C707S793000, C707S793000
Reexamination Certificate
active
06289339
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to computer databases, and more particularly, to a method and apparatus for enabling a view of data across a database.
BACKGROUND OF THE INVENTION
Multiple computer databases or databases with multiple partitions pose special problems for database designers. In many cases, it is desirable to have a set of databases that hold all data, but where each user of the system has a unique view into that data. Stated another way, each user would have access to just a subset of all available data. However, database designers are limited by software applications that each require the appearance of a single database.
In computer networking environments which store network topology information, one problem is to maintain multiple, independent databases where each single network topology database is located on a physically distinct machine. Topology processes on each machine typically write to their own database and are not aware of each other. To accommodate current software applications, the databases must have the appearance of a single database or single datascape to maintain backward compatibility and eliminate the need for special applications to handle multiple databases explicitly.
When displaying network information to system users, a union of all data in view must be formed across the multiple databases, resolving duplicated and/or missing data. To give the appearance that the data came from a single, self-consistent database, the resulting datascape typically must be uniform, logically consistent, and homogeneous. In addition, information must be gathered from multiple databases in an efficient and seamless manner.
Therefore, there is a need for a way to implement multiple computer databases or databases with multiple partitions where a single, unique view is presented to each user of the system. There is a further need to have the database appear as a single database to software applications. There is a further need to gather information from databases in an efficient and seamless manner.
SUMMARY OF THE INVENTION
The present invention provides a method, apparatus and article of manufacture for filtering a notification message from a database. A database is received by the system. The database is logically partitioned into a first partition and a second partition, the first partition having a first object instance, the second partition having a second object instance. The notification message is transmitted from the database to a message recipient. The notification message is filtered based upon a notification message type and a viewage table. In one embodiment, a message channel can be created having a database identifier attribute and a message type attribute. The notification message is transmitted between the database and the message channel if the notification message matches the message channel database identifier attribute and the message type attribute. The notification message is transmitted between the message channel and the message recipient if the target partition ID of the notification message matches a partition ID in the viewage table.
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Choules Jack
Lewis Cheryl
Nortel Networks Limited
Sokoloff Blakely
Taylor & Zafman LLP
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