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Re: DR and data replication on Oracle 9i Standard

From: Mark D Powell <>
Date: Sat, 1 Dec 2007 06:58:24 -0800 (PST)
Message-ID: <>

On Dec 1, 6:59 am, cqmman <> wrote:
> Hello,
> We have two windows servers in different locations, and are currently
> logshipping from one to the other, to provide an almost realtime copy
> at the remote site. The theory being that we can bring it up with
> minimal data loss in the event of losing the primary site. We have
> very little in the way of Oracle skills (read, practically none).
> We are purchasing a SAN solution at both the production and DR site
> (too far from each otherfor sync writes unfortunately), and are
> wondering if there is another way to doing this.
> One suggestion has been to take snapshots of the oracle server and
> replicate those snapshots (well the delta's) to the DR site every five
> minutes (often mentioned with putting the Oracle DB in hot-backup mode
> first).
> Is this going to be a workable solution?
> The reason for looking at solutions other than logshipping is that we
> don't have any real oracle skills, so if we can do the data
> replication at a lower level (without compromising data integrity) it
> would be easier for us. However, It seems like despite the addition of
> a SAN, we are better off ignoring that and using logshipping.
> Thanks

In order to get al the Oracle datafiles and logs in sync you would have to suspend the Oracle IO operations. Doing this once every 5 minutes would probably not be conductive to performance. Log shipping is probably a better solution.

Extended RAC is also a potential solution. How many miles apart are the two sites?

How much data loss is considered acceptable?

Traditional replication might be a solution though DG should be better though cost/benefit may be a consideration also.

HTH -- Mark D Powell -- Received on Sat Dec 01 2007 - 08:58:24 CST

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