Real Application Clusters
Local Rolling Database Maintenance
Local Rolling Database Maintenance creates a new local database home and starts a second instance of the same database from the new home on the same server, allowing you to perform rolling patching and maintenance operations locally on one node of a multi-node Oracle Real Application Clusters (Oracle RAC) or Oracle RAC One Node cluster.
Local Rolling Database Maintenance provides uninterrupted database availability during maintenance activities (such as patching) for Oracle RAC and Oracle RAC One Node databases. This feature significantly improves the availability of your databases while limiting the impact on other nodes in the cluster.