Re: Oracle High Availability Question(s)

From: Tim Gorman <>
Date: Wed, 14 Feb 2018 13:27:25 -0700
Message-ID: <>

Whether you have RAC licensing or not, anyone is far better off deploying Data Guard for high availability.

Data Guard is designed for high-availability and disaster-recovery first and foremost.† RAC is designed as a scalability solution first and foremost, and the only way Oracle gets away with marketing it as an availability solution is because RAC must include fault tolerance against node failure to even operate.† RAC is wonderful and mature software, but using it for availability is an adaptation.

On 2/14/18 12:10, Hans Forbrich wrote:
> You might want to look up 'stretch RAC'
> One useful article is Oracle's wwhite paper
> disclaimer: My opinion, not my employer's
> /Hans
> On 2018-02-14 11:59 AM, Scott Canaan wrote:
>> Currently, we donít have a license for RAC,† therefore we arenít
>> using it.† We have one application in particular that is required to
>> be available as close to 7 x 24 x 365 as possible.† One other
>> requirement is that the redundancy includes physical disk, with one
>> set of disks in one location and the redundant set in another
>> location.† In looking at RAC, it appears that a shared disk (or disk
>> group) is used which doesnít satisfy the second requirement.† So far,
>> I have not found a description of RAC that shows it using more than
>> one disk / disk group for redundancy.† What is the best way to
>> accomplish the second requirement?

Received on Wed Feb 14 2018 - 21:27:25 CET

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