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EP0593062A2
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Redundant networked database system
Assignee: Siemens Energy and Automation Inc
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Filing: 1993-10-14
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Granted: —
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Expires: 2013-10-14
Abstract
Abstract A Redundant Networked Database System is taught. Briefly stated, Control System Computers are designated for primary and backup database operation with applications being inputable to either primary or backup. Upon changes to the database, the primary and backup communication agents communicate with each other and to automatically update the backup. In this fashion, the primary and backup databases are automatically synchronized without manual intervention or the need for reinputting of the changes to the backup database.
Inventors
- 👤 David Jackson Marks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G06F11/2053; G06F11/2094; G06F11/2097; G06F2201/00; G06F2201/80; Y; Y10; Y10S; Y10S707/00; Y10S707/99951; Y10S707/99952; Y10S707/99953
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A redundant network database system, comprising: a first computer having a means for storing a primary database and at least one second computer, having a means for storing a backup database; Communication link means for connecting and operatively interconnectable with said first computer and said at least one second computer; first means disposed in said first computer for sensing a change to said primary database and second means in said at least one second computer for sensing a change in said backup database, said first means and said second means producing an indication thereof of a change in the respective databases; and communication agent means disposed in said first computer and in said at least one second computer for sensing the indication produced by said first means and said second means, whereby any changes to said primary database are communicated to said backup database.
Claim 2
Dependent Claim
27 words
A device according to claim 1 wherein said communication link is bidirectional such that any changes to said backup database are automatically transmitted to said primary database.
Claim 3
Dependent Claim
28 words
A device according to claim 1 wherein communication link failures detected by said first computer are automatically transmitted to said at least one second computer and vice versa.
Claim 4
Independent Claim
75 words
A method for automatic redundant network database management having at least two control system computers, a primary computer and a backup computer each of which has a database, said computers interconnected in a network, comprising the steps of: A. Initiating communication between said computers; B. Detecting a change in the databases associated with said computers; and C. automatically updating the database of each previously unaltered database with the changes made to the said altered database.
Claim 5
Dependent Claim
30 words
A method according to claim 4 comprising the additional step of: D. logging an error condition in the primary computers database upon detecting a failure of a primary database operation.
Claim 6
Dependent Claim
29 words
A method according to claim 5 comprising the additional step of: D. rolling back the change to the primary computer database upon detection of a primary computer database operation.
Claim 7
Dependent Claim
35 words
A method according to claim 4 comprising the additional step of: D. transmitting am error condition from said backup database computer to said primary computer database upon said backup computer detecting a database operation error.
Claim 8
Dependent Claim
31 words
A method according to claim 4 comprising the additional step of: D. said primary computer discontinuing the communication between said computers upon said primary computer detecting a failure in said network.
Claim 9
Dependent Claim
55 words
A device according to claim 8 comprising the additional step of: E. queuing in said primary computer database changes to the primary computer upon failure of the network; and F. transmitting said queued database information to said backup computer database upon reestablishing of communications in said network between said primary computer and said secondary computer.
Claim 10
Dependent Claim
34 words
A method according to claim 4 comprising the additional step of: D. rolling back any transactions in progress in said backup computer database upon said backup computer database detecting a failure in the network.
References Cited (Backward Citations)
No citation records indexed.
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