Re: RAID

From: Jeremiah Wilton <jeremiah_at_wolfenet.com>
Date: Thu, 8 Oct 1998 22:31:23 -0700
Message-ID: <Pine.OSF.3.95.981008221812.22416C-100000@gonzo.wolfenet.com>

On 9 Oct 1998, Jonathan Gennick wrote:
>
> ... If you lose just the redo logs, you are ok. If you
> lose just the data, you are ok (in archive log mode). Lose
> both and you could be in trouble.

If you lose your redologs, the instance will crash. How will crash recovery complete on restart if your redologs are gone? Loss of all online redologs is a situation that requires recovery from backup. That's why it is a good idea to mirror them or "multiplex" as Oracle likes to call it. Even with archivelog mode on, you will only be archived up to the log before the current one.

Also, even if you have all your redologs, archived and online, you will need a copy of the datafiles from some point in time, from which to recover forward.

--
Jeremiah Wilton http://www.wolfenet.com/~jeremiah Received on Fri Oct 09 1998 - 00:31:23 CDT