Shahid,
It is a common misconception that Oracle does not write to files when those
are in hot backup mode. A few books gives the reader this impression. But it
is not true.
Jeremiah Wilton had written an excellent note about this. I suggest you read
it at http://www.speakeasy.org/~jwilton/hot-backup.html. Also, the Backup
and Recovery Handbook by Rama Velpuri addresses this issue in great detail.
What you are trying to do with triple mirroring (and silvering) should work
fine. I still urge you that test the recovery process to make sure your
strategy works in each Recovery scenarios.

Good luck.

Regards,

- Kirti Deshpande
Verizon Information Services
http://www.superpages.com

> -----Original Message-----
> From: [Email Address Removed] [SMTP:[Email Address Removed] Sent: Saturday, June 30, 2001 8:21 AM
> To: LazyDBA.com Discussion
> Subject: tripple mirroring
>
> during a hot backup why the data files are still being updated? I though
> they would go on read only and all updates will route to redo logs.
> If yes, then we are simply copying open files with possible update?
> We were thinking of using tripple mirroring (silvering) for hot backups
> but
> now with this , how would the internal logic be if we break the third
> mirror?
>
> Thanks
>
>
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