CONFIGURATION DATABASE SYSTEM, DISTRIBUTED CONFIGURATION DATABASE SYSTEM, METHOD FOR STORING AND USING CONFIGURATION DATA, DATABASE SERVER, METHOD FOR PROVIDING ACCESS TO DATABASE COMPONENT, METHOD FOR USING DATABASE SERVER TO PROVIDE PARALLEL ACCESS TO COMPONENT STORED IN DATABASE, AND PROCESS CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To enable users at each of different locations to change a configuration database in a timely, secure and non-conflicting manner.

SOLUTION: A configuration database includes multiple databases distributed at a plurality of physical locations within a process control system. Each of the databases stores a subset of the configuration data and this subset can be accessed by users at any of the sites within the system. To prevent the configuration data being viewed by subscribers within the system from becoming stale, the database server automatically detects changes to each item within the database and sends notifications of changes made to the item to each of the subscribers.

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