Internal Error nhiDbServer Pgm nhiDbServer: Database error: (ORA-00018: maximum number of sessions exceeded). (cdb/cdbJobAddRunRow)
In eHealth DR environment, eHealth and Oracle should be running only on Active system and all related services should be stopped. To resolve the problem, check if Oracle or EH services are running on standby system. If so, shut it down and disable them or set them to start manually on it. Once done, check task manager for any running process starting with nh* nhi* ora* and kill them if found.
On primary server, shutdown and restart the eHealth and Oracle server processes to clear the connections: