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Does RMAN copy the entire datafile during hotbackup or does it copy only the blocks containing data?
For eg: If the datafile is 1GB but only contains 200MB of data, then does RAMN copy the entire 1GB datafile or only the 200MB (Oracle blocks)?
TIA
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it copies data block which has ever been used, i.e skips blocks which have never been used
but if you are using image copy then it copies everything
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Just to demonstrate a little bit using RMAN hot backups:
The three files created from my RMAN hot backup process totals 500MB. In OEM, the sum of all the tablespaces sizes 1.6GB
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