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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Some Dataguard is good, lots more must be better? (specifically, when do most actual failovers really occur?)
On Wed, 2006-09-20 at 17:07 +0000, Laimutis Nedzinskas wrote:
> Now regarding DG with time lag. Well, it is not a good option for
> maximum data protection(as Oracle defines it.) At least I do not know
> how to protect redo logs in this mode. Which means that for maximum data
> protection you have to have a standby database which is in complete
> sync, i.e. running in maximum protection mode(at least most of the
> time.) BUT I am not sure if file system snapshot technique can achieve
> this either.
Laimutis,
Maybe the delay concept confuses you a little. Maximum protection and
Delay actually go together very well.!
Maximum protecion gurantees that redo is written at the standby at the
time the commit finishes.
Delay allows you to wait a certain amount of time to apply the redo.
So, all redo IS protected in maximum protection mode, even if a delay is configured. The standby can be in read only mode and still protect your data.
Best regards,
Carel-Jan Engel
===
If you think education is expensive, try ignorance. (Derek Bok)
===
-- http://www.freelists.org/webpage/oracle-lReceived on Wed Sep 20 2006 - 16:56:03 CDT
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