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Apparatus and method for performing the backup of a primary database using a back up database

  • US 5,615,364 A
  • Filed: 07/06/1995
  • Issued: 03/25/1997
  • Est. Priority Date: 10/16/1992
  • Status: Expired due to Term
First Claim
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1. 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 primary and backup computers;

    (B) communicating from each one of said primary and backup computers to the other of said primary and backup computers each change in the database associated with said one computer individually, for shadowing said change in said database of said one computer;

    (C) automatically updating the database of the other of said primary and backup computers with the changes made to the said one database;

    (D) discontinuing the communication between said primary and backup computers upon a detection by said primary computer of a failure of said network;

    (E) rolling back a shadowed transaction in progress in said backup computer when said communication is discontinued;

    (F) queuing, in said primary computer database, changes to the primary database upon said detection of the failure of said network; and

    (G) transmitting, from said primary computer, said queued database changes to said backup computer, upon reestablishing of communications in said network.

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