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RMAN - backup file sizes appear too small

edited Oct 19, 2012 9:58PM in Database Backup and Recovery (MOSC) 4 commentsAnswered ✓
I created a new Oracle database and enabled RMAN.  The database size is about 150gig.  Although, I'm only using about 1 gig worth of data.  This is because I pre-allocated the tablespaces for future use.  When I run a full rman backup, the total of the backup files created is only about 100 meg.  I would have expected much larger sizes considering the datafiles are around 25 gig a piece.   I'm using Oracle 11.2.0.2 on AIX.

Would this be normal?  I thought RMAN backed up the entire datafile versus whats actually in it (with compression). 

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