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Database system configured for automatic failover with no data loss

  • US 20070124347A1
  • Filed: 11/22/2006
  • Published: 05/31/2007
  • Est. Priority Date: 11/30/2005
  • Status: Active Grant
First Claim
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1. An automatic failover configuration comprising:

  • participants including a primary database system that processes transactions and produces redo data therefor;

    a standby database system that receives the redo data via a communications link;

    an observer; and

    system state specifiers which prevent the automatic failover from resulting in divergence of the database systems while permitting the primary database system to continue to process redo data when both the observer and the standby database system are absent as long as the observer and the standby database system became absent sequentially.

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