I am running SAP R/3x200 on a 9.2.0.5 database. I perform a nightly
backup to disk (SAN) of Prod and Dev systems, which run at different
times, using SAP BRBACKUP which uses RMAN. The db sizes are 60G and 45G
respectively. I am getting markedly different backup times for both
systems. The times can vary from 40 mins - 5 hours for Dev, and 1 hour
- 7 hours for Prod. The time taken to backup each 2G datafile is around
1-2 mins if running well, but can take up to 15 mins each. There is no
pattern, over time, for the time taken per datafile for either
instance. Both are seperate servers and dbs.
I have ruled out the network as the cause, as it has completely changed
from a 100Mb to 1G LAN, on different equipment, with no change to the
general randomness of the backup times, except that is runs faster on
the Gig Lan. The backups run through a completely private LAN via the
second NIC. There are no network errors during backup, and no other
background jobs in the db at that time, and there is zero user activity
at these times.
Are there any known Oracle issues that relate to these symptoms? I have
searched through the net without finding any similar problem or
reference to it..
Regards,
James
Received on Sun Dec 04 2005 - 18:01:56 CST
