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Oracle EXADATA OEM 12c agent detection issue

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