Rollback Option
To direct the DBMS Server to back out all rows appended by the copy if the copy is terminated due to an error, specify with rollback=enabled. To retain the appended rows, specify with rollback=disabled. The default is with rollback=enabled. When copying to a file, the with rollback clause has no effect.
The rollback=disabled option does not mean that a transaction cannot be rolled back. Database server errors that indicate data corruption still causes rollback, and rows are committed until the transaction is complete.