RMAN-05558：Must specify DB_UNIQUE_NAME with FOR STANDBY clause
错误码
错误描述：Must specify DB_UNIQUE_NAME with FOR STANDBY clause
错误原因：A DUPLICATE FOR STANDBY ... SPFILE command was issued but DB_UNIQUE_NAME was not provided for the standby database.
解决方法：Specify a DB_UNIQUE_NAME in the SPFILE clause for the standby database.
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