Oracle : Ошибка ORA-03113

"end-of-file on communication channel"
*Cause: The connection between Client and Server process was broken.
*Action: There was a communication error that requires further investigation.
First, check for network problems and review the SQL*Net setup.
Also, look in the alert.log file for any errors. Finally, test to
see whether the server process is dead and whether a trace file
was generated at failure time.

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