Sometime after the Exadata installation, we find the Enterprise manager Does not Detect the DB NODE and all the cluster properly.
This is due to that OEM 12 C agent was configured by the properly while installation. (this have been noticed many times)
Solution:
$AGENT_HOME/bin/emctl config agent addinternaltargets $AGENT_HOME/bin/emctl stop agent $AGENT_HOME/bin/emctl clearstate agent $AGENT_HOME/bin/emctl secure agent <password> $AGENT_HOME/bin/emctl start agent $AGENT_HOME/bin/emctl upload $AGENT_HOME/bin/emctl status agent
After this, you will be able to process