RE: Duplicate function is a lot longer than a backup

Have you tried and timed a restore operation, to determine if it will still 
take so long?

One reason for such difference can be the fact that RMAN skips never used 
blocks doing the backup - so if I create a huge 1TB tablespace but leave it 
empty, it will still backup it up in just few seconds. However, during 
restore/duplicate, the datafiles are created at their actual size - so restore 
of that 1TB tablespace would still take a long time (depending on OS, some 
could still do it fast, creating the file as sparse). In real world the 
difference is usually not so big, but still could do a bold difference in time 
needed for the restore.
Could this be your case?

Vit Spinka

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