Database system configured for automatic failover with no data loss
作者： George H. Claborn , Stephen John Vivian , Raymond Guzman , Robert R. McGuirk , Douglas Voss
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摘要: Techniques used in an automatic failover configuration having a primary database system, standby and observer for preventing divergence among the systems while increasing availability of system. In configuration, system remains available even absence both as long become absent sequentially. The further permits only when is present are synchronized inhibits state changes during failover. have copies techniques include propagating most recent version databases using carefully-ordered writes to ensure that propagated fashion which prevents divergence.
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