Oracle RAC One Node
Oracle introduced a new option called RAC One Node starting from release Oracle 11g. This option is available with Enterprise Edition only. It provide a cold failover solution for Oracle database. It’s a single instance of Oracle RAC running on one node of the cluster while the second node is in a cold standby mode. If the instance fails then RAC One Node detects it and trie to restart the instance on the same node. The instance is relocated to the second node in case there is a failure or fault in 1st node and the instance cannot be restarted...