RMAN-06028：duplicate operand specified in restore specification
错误码
错误描述：duplicate operand specified in restore specification
错误原因：The CHANNEL, TAG, FROM, PARMS, VALIDATE, DEVICE TYPE, CHECK READONLY or DB_UNIQUE_NAME option was specified more than once in the restore command or in one of the restore specifications.
解决方法：Correct and resubmit the command.
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