RMAN: invalid size at "list backup;"

Hi,
when I exec a "list backup;" with RMAN the shown Size value of a backup piece are not equal to file size of the backup piece if the filesystem. Sometimes there are differences up to 50%. I found no reason why both values differ, as "Size" is sometomes smaller and otherwise bigger than the file size. Can you help me ???
greets,
Rainer Received on Wed Aug 17 2005 - 09:47:17 CDT