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ORA-01940:

cannot drop a user that is currently connected
Cause: Attempt was made to drop a user that is currently logged in.
Action: Make sure user is logged off, then repeat command.
 SubjectReplies
1.ORA-01940: cannot drop a user that is currently...1
2.ORA-01940: cannot drop a user that is currently...1
3.contexts: getting DDL1