XAG-00220：Instance 'string' was already registered.
错误码
错误描述：Instance 'string' was already registered.
错误原因：The instance name specified on the command line is already registered to Oracle Clusterware.
解决方法：If this is the expected state then this is not an error. If it is not then an instance can be removed with the 'agctl remove' command.
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