When I turned on the compression, all the 4 cpu's just pegged on a pretty good solid machine because we had 4 threads. We have played around a lot with tuning the backups which made the difference. We have backed up to Disk and tape. Pros/cons with both like write to multiple tapes as recovery is faster etc. I think we get about 160gig backed up per hour on average Brian -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Tomi Wijanto Sent: Wednesday, August 02, 2006 6:09 AM To: oracle-l@xxxxxxxxxxxxx Subject: Re: rman compressed backup is much smaller but very slow It's seem that your system is I/O bound. Smaller backup size result in faster time. Mine seems to be CPU bound. regards, tomi --- "Radoulov, Dimitre" <cichomitiko@xxxxxxxxx> wrote: > > Could someone shared their experieces on > compressed > > backup, especially with big sized database. > > Red Hat Enterprise Linux ES release 3 (Taroon Update > 4) > Oracle Database 10g Release 10.2.0.2.0 SE > > Not a big size database: 30GB (~18GB used), backed > up on a NFS mounted drive (all filesystems are ext3 > type). > > full backup without compress: backup sets size > ~13GB, elapsed 37min > full backup with compress: backup set size < 2GB, > elapsed 26min > > BACKUP OPTIMIZATION OFF > PARALLELISM 1 (SE doesn't support parallelism > 1) > > > Regards > Dimitre __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l