Who decides the surviving node during the detection of split brain?

How oracle decides which node be deported upon detection of split brain when all nodes have written in the voting record, but unable to check the heart rate through interconnection.

Ajay

Hi Ajay,

the complexity of this depends on the amount of nodes in the cluster and how is isolated (and how), but generally speaking "the cluster creates an invisible group (cohorts) between nodes, which could potentially cause corruption and should be resolved. » Oracle Clusterware manages the "split brain" scenario in putting an end to all nodes in the smallest cohort. "If the cohorts are the same size, the cohort with the smallest number node inside survives." (Cited in Apress - Expert Oracle RAC diagnostic Performance and Tuning by Murali vandenberghe)

Best regards

Stefan Koehler

Researcher and consultant independent of Oracle performance

Twitter: @OracleSK

Tags: Database

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