Accessing and updating a configuration database from distributed physical locations within a process control system
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United States of America Patent
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Feb 3, 2004
Grant Date -
N/A
app pub date -
Apr 28, 2000
filing date -
Oct 18, 1999
priority date (Note) -
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Abstract
A configuration database includes multiple databases distributed at a plurality of physical locations within a process control system. Each of the databases may be accessed by users at any of the sites within the process control system. A database server having a shared cache accesses a database in a manner that enables multiple subscribers to read configuration data from the database with only a minimal number of reads to the database. To prevent the configuration data being viewed by subscribers within the process control system from becoming stale, the database server automatically detects changes to an item within the configuration database and sends notifications of changes made to the item the each of the subscribers of that item so that a user always views the state of the configuration as it actually exists within the configuration database.
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