RMAN-06441：cannot upgrade catalog - catalog is already newer than this RMAN
错误码
错误描述：cannot upgrade catalog - catalog is already newer than this RMAN
错误原因：The recovery catalog is already at a version level that is greater than this version of the Recovery Manager. The UPGRADE CATALOG command is not needed.
解决方法：Either upgrade to a more recent Recovery Manager, or continue to use the current version. Message 6191 will be issued if the recovery catalog is too new to work with this version of Recovery Manager.
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