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For Oracle RAC, install the Dbvisit Replicate software on all RAC nodes in the cluster. Dbvisit Replicate will only ever be active on one node (however Dbvisit Replicate will mine all RAC threads simultaneously) and Oracle clusterware is used to start Dbvisit Replicate on another node should the current node go down.
Please see http://www.dbvisit.com/content/freeTechGuides/RAC_and_HA_best_practices.pdf on how to configure Dbvisit Replicate with clusterware.