Re: Mirrored disks Vs duplexed logs

If Oracle receives an error on a write to a redo log, it will mark that logfile as STALE. As a result, if the Redo Log Group has only One member from Oracle's perspective, a write error would cause the entire group to be STALE and Oracle would have errors the next time it tries to write to that group. To avoid this situation, I believe it is always better to mirror from within Oracle than at the Operating System.

Raju Patel
Oracle Database Specialist
Infogration Inc.

Steven_Dodsworth_at_qsp.co.uk wrote:
>
> Hello world,
>
> This seems a daft question, but here goes.
>
> Oracle recommends having duplexed redo logs in case of disk failure. I read
> that to be similar to mirroring. If a database resides on a system that has
> disk mirroring, do the redo logs still have to be duplexed - I cannot think of
> a reason to still have more than one 'database defined' copy. Does any one
> know of any reason to keep two 'database configured' copies.
>
> Bye,
>
> Steve
>
> opinions expressed are mine and do not
> necessarily represent those of my employer
Received on Tue Jul 02 1996 - 00:00:00 CEST