ORA-03113 usually means that the Oracle Server process for the current session has crashed. Can you check if a user trace dump file exist on the database server that corresponds to this ORA-03113 error? Usually you will see an ORA-00600 error here, with some error codes that may help us find the cause of the problem. If it does, can you send it to me?
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Marco Kalter
Allround Automations