Depends on your underlying storage for that "disk". If you have any
kind of raid, chances are it will be faster as you will have a higher
IO queue. Remember you need to have more then 1 io at any given time
to benefit from RAID.
Seems like this is Oracle 9i, but if you were on 10g, you could be
using compressed backupsets, in which case chances are you will
definetelly increase backup speed as your limiting factor would be CPU
and parallelising will allow you to use more CPUs for the backup.
--
Christo Kutrovsky
DBA Team Lead
The Pythian Group - www.pythian.com
I blog at http://www.pythian.com/blogs/
On 12/19/07, Joe Smith <joe_dba_at_hotmail.com> wrote:
> Does it make any sense to run 4 processes for a rman full database backup
> when you have configured only 1 default channel?
>
> The channel is a disk and the backup files are all going to that same disk.
>
> CONFIGURE DEVICE TYPE DISK PARALLELISM 4; # default
>
> CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT
> '/u01/backup/oracle_sid/bu.d%d.t%t.s%s.p%p' MAXPIECESIZE 1
> G;
>
>
> Is this going to run faster or the fact of a single disk will slow it down?
>
> thanks.
>
>
>
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--
Christo Kutrovsky
Senior Database/System Administrator
The Pythian Group - www.pythian.com
I blog at http://www.pythian.com/blogs/
--
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Received on Wed Dec 19 2007 - 15:53:18 CST
