I believe that RMAN only backs up blocks that have been allocated to an oracle object 
- index, segment, table, etc.  If the block is in a datafile but not in use by an 
oracle object (that is, the block is free), then RMAN doesn't backup those blocks.
Steve

>>> [EMAIL PROTECTED] 04/30/01 12:25PM >>>
DBAs

I have taken hot backup using RMAN. The total Size of the Database is
5200MB(By Sum(byes) in Dba_data_files). Where us the backup file size put
together is 4600MB. 

Where am I missing the remaining 600MB?

Thanks

Raj
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