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 ORA-01092: ORACLE instance terminated. Disconnection forced

The instance you were connected to was terminated abnormally, probably via a shutdown abort or a crash.



Best thing to do is to have a look for trace files in the background_dump_dest and check the alert.log in the same location.


You might find a trace file for the smon or pmon process indicating the real problem (eg. cleanup lock conflict, ...).


You'll have to restart the database:

Connect using SYSDBA and issue the startup or startup force command.