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Database system configured for automatic failover with no data loss

  • US 7,668,879 B2
  • Filed: 11/22/2006
  • Issued: 02/23/2010
  • Est. Priority Date: 11/30/2005
  • Status: Active Grant
First Claim
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1. An automatic failover configuration comprising:

  • participants includinga primary database system that processes transactions and produces redo data therefor,a standby database system that receives the redo data via a communications link, andan observer,each participant including a processor that has access to memory; and

    system state specifiers in the memory, the system state specifiers including a synchronized system state specifier that prevents divergence resulting from a lack of synchrony between the primary database system and the standby database system with regard to the redo data at the time of an automatic failover andthe system state specifiers preventing 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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