re: RMAN impact

hello again,
  I don't have any real-world experience with RMAN but I'm contending w/ the 
DBA who says running backups through RMAN, **every day**, for 10 hours, does 
not impact  our production performance.  Never-you-mind that these backups are 
*full backups* ;-)
   
  so, can anyone tell me what kind of impact RMAN usually brings to a system, 
rather what toll it takes on one!  :-)
   
  thx,
  Cos

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