Perhaps, you are hitting the issue described in this blog post - http://www.pythian.com/blogs/363/slow-rman-backups-check-this-out On 2/26/07, Orysia Husak <Orysia.Husak@xxxxxxxxxxxxx> wrote:
After we upgraded one of our databases from 10.2.0.1 to 10.2.0.2, our rman backup took 4 to 5 times longer. We began seeing that 65% of the time was being spent in control file sequential reads. We have googled, did metalink searches, and submitted an SR, but haven't been able to determine what is causing the control file sequential read waits.
-- Best regards, Alex Gorbachev http://www.oracloid.com -- http://www.freelists.org/webpage/oracle-l