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ORA-20603: Updating timezone region of a target is not supported.
Enterprise manager does not start after updating the database. The emdb.nohup has an ORA-20603: Updating timezone region of a target is not supported error message in it.
The problem
The timezones have been updated within the database.
Solution
As Oracle run:
$ORACLE_HOME/bin/emctl resetTZ agent
and follow the instructions. You'll need the sysman or sys password to make the changes.
