Accessing and updating a configuration database from distributed physical locations within a process control system
US6687698B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2000 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Apr 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99953
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.