Re: RMAN restore times
- From: Dennis Williams <oracledba.williams@xxxxxxxxx>
- To: somckit.khemmanivanh@xxxxxxxxxxxxxxxx
- Date: Mon, 8 Aug 2005 08:57:55 -0500
Khemmanivanh,
One point that is often overlooked: is the database stored on RAID-5? I ask
because large databases often use RAID-5. Today with caches, RAID-5 often
offers reasonable performance, so we get comfortable with it. However,
remember that RAID-5 means slow writes. In a recovery situation, large
amounts of data are being written to disk. The cache quickly fills and then
you are observing the slow writes.
I agree to look at BCV technology. Another idea is to back up to disk. Say
you have a large database with only a small amount of updating. For
simplicity, assume only 2 disk systems. Back up the files on system A to
system B, and vice versa. Now, if you lose system B, tell Oracle those files
are now on system A, and apply recovery. I haven't worked out all the
details of this scenario, but I think it holds promise.
Dennis Williams
>
> 2) Regarding restore times, what times have people been seeing with
> RMAN? If you can post your tape technology that would be much
> appreciated. If we stick with BCV then it's really hard to beat that
> technology for restore times but can we get close?
>
>
Other related posts:
