Oracle-L: Re:RE: Stand-by (Oracle9i Data Guard) vs. Replication

From: <dgoulet_at_vicr.com>
Date: Mon, 25 Mar 2002 11:38:54 -0800
Message-ID: <F001.00432696.20020325113854@fatcity.com>

Robert,

Given what you've said it would appear that your only choice is going to be symetric/advanced replication, multi-master. The conflict resolution rules may be a bear to set up with 5 sites though. Using a standby db would not be very effective since data updates are dependent on the archive log switch points and that does not address the different sites if your reason for failure is a network related one. Snapshots won't work either since they are read only.

Dick Goulet

____________________Reply Separator____________________
Author: "Freeman; Robert " <Robert_Freeman_at_csx.com>
Date:       3/25/2002 9:48 AM

Pretty stringent. They want as little latency as possible. Changes at a master should be available to all sites ASAP. Now, they could all go to one central site, and thats ok as long as our networking is healthy, but if it goes down, there is a requirement that they be able to work independently (there are 4-5 sites) and then all changes need to be synchronized. Data loss is secondary to availability however.

These requirements smack of trouble to me.

Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration

The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.

-----Original Message-----
Sent: Monday, March 25, 2002 11:48 AM
To: Multiple recipients of list ORACLE-L

What type of requirement or SLA do you have in regards to keeping the instances in sync?

-Joe

"Freeman, Robert " <Robert_Freeman_at_csx.com> wrote:
> Stand-by (Oracle9i Data Guard) vs. Replication
>
> Folks,
>
> I have a mission critical system we are architectonic right now.
> There is some argument of the merits of replication vs. using
> Standby database going on.
>
> Current we have 4 sites that we will be replicating data back and
> forth between. There are 3 kinds of data:
>
> 1. Network Critical data (must be available for entire network)
> 2. Regional Critical data (only used for a given region. site =
> region).
> 3. Regional non-critical data (this is data that is easily
> recovered from
> other operational data stores).
>
> I can load you up with details, but for now this is the general
> requirement. We want a given site to be able to work independently
> of the other sites in the event of network failure (WAN).
>
> What I'm looking for is your experience with using replication
> for HA solutions vs. stand-by databases. I've also considered using
> standby databases as a possible solution to this problem, along
> with
> using transportable tablespaces to re-sync the databases once
> everything
> comes up. I'm concerned with replication in that there is allot to
> break,
> and I'm concerned about synchronization issues in general with
> either
> solution.
>
> Thoughts?
>
> RF
>
>
> Robert G. Freeman - Oracle8i OCP
> Oracle DBA Technical Lead
> CSX Midtier Database Administration
>
> The Cigarette Smoking Man: Anyone who can appease a man's
> conscience can
> take his freedom away from him.
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Freeman, Robert
> INET: Robert_Freeman_at_csx.com
>
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Author: Freeman, Robert 
  INET: Robert_Freeman_at_csx.com

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Received on Mon Mar 25 2002 - 13:38:54 CST