"Cause: An error occurred during a data send. This message is not normally visible to the user.
In addition, this message could occur when any of the following SQL*Plus commands have been issued:
SHUTDOWN ABORT SHUTDOWN IMMEDIATE SHUTDOWN TRANSACTIONAL
Action: For further details, turn on tracing and re-execute the operation. If the error persists, contact Oracle Support Services."
When I receive this error, I exit out of SQL*Plus. Then I set my oracle home and sid. For example, in Windows: set Oracle_home=c:myoraclehome; and set Oracle_sid=test. Then try your Oracle command again.
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