Introduction
Oracle Grid Infrastructure 11.2.0.2 has many features including Cluster Node Membership, Cluster Resource Management and Cluster Resources monitoring. One of the key area where DBA need to have expert knowledge on how the cluster node membership works and how the cluster decides to take out node should there be a heart beat network, voting disk or node specific issues. I have written about this before and this article specifically focuses on the 11g R2 features and I will also try to explain the reboot less node fencing.