I've just seen weird things about my rman backup to disk.
I run rman backup on 8i AIX 4.3.3. but I forgot to set the output format to direct it to a bigger disk space which is in /u04. Instead it defaulted to /u01/app/oracle/product/8.1.7/dbs. So I aborted the process immediately. When I ls -l the size of the output, i was surprised that it is 16Gb+ but my /u01 disk has onlly 2gb freespace.
It seems that it is taking a virtual space from somewhere? Is this normal about rman backups? Can I delete the output or do i have to
run some rman cleanup commands whenever I aborted an rman process.
I rerun the process again using the right output disk and i check
the outfile size and they have same size with the first aborted one.
But the process is taking so long. I wonder if it got locked up with
the aborted 1st run.
I just thought RMAN output would be a compressed one like export.
I get 2.5gb when i exported the whole db. but rman got 15gb.
does it copy the whole file systems? how about large temp and rbs
tablespaces that doesnt have data contents or data tablespaces that
have few or no tables yet.