ADDM for Oracle Real Application Clusters

In an Oracle Real Application Clusters (Oracle RAC) environment, you can use ADDM to analyze the throughput performance of a database cluster. ADDM for Oracle RAC considers DB time as the sum of database times for all database instances and reports findings that are significant at the cluster level. For example, the I/O levels of each cluster node may be insignificant when considered locally, but the aggregate I/O level may be a significant problem for the cluster as a whole.