RE: rman compressed backup is much smaller but very slow

["Spears, Brian" <BSpears@xxxxxxxxxxxxxxxxx>]

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


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• References:
  • Re: rman compressed backup is much smaller but very slow
    • From: Tomi Wijanto

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