Very nice description of how to migrate em 18.104.22.168.0 from a non cdb to a cdb into a pdb. Thanks, Maaz Anjum!
Ever ran into an ORA-19755 with RMAN duplicate from target? When your source database uses block change tracking?
Try patch 11744544; it fixes the bug which could might cause block change tracking recreation fail in combination with OMF newnames.
A workaround would be to disable change tracking before duplicating.
Darn, I had it also, the agent in GRID control in not uploading to the OMS and there is just too much to upload. One can change em.loader.maxDirectLoadFileSz but the following can be done to (you will lose some info but hey..)
Now fix it:
rm lastupld.xml agntstmp.txt
No need to remove storage directory under $AGENT_HOME/sysman/emd/state
./emctl start agent
./emctl status agent
Useful Doc ID: 265769.1 at Metalink. It is intended for DBA’s and support analysts experiencing 10g or 11.1 Clusterware Reboots. For 11.2 and above, see Note: 1050693.1