Re: 2 Node RAC Standby -- A mix of Managed Recovery and Read only?

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Wed, 05 Jan 2005 21:48:24 -0700


No, this is not possible.

A RAC database first has to be mounted in shared/parallel mode before any
instance can open it.

When one instance is in managed standby mode, it is mounted standby, not
mounted shared/parallel or exclusive.  So, the other instance can not even
be mounted, much less be opened read-only or read-write.  However, you
probably can start the second instance in nomount mode, but that's not what
takes the most time during a startup.

Hope this helps...


on 1/5/05 9:36 PM, Sriram Kumar at k.sriramkumar@xxxxxxxxx wrote:

> Hi Gurus,
> Firstly, I wish each and everyone of you a very happy, prosperous and
> a healthy New Year.
> I have a doubt regarding 2 Node RAC standby database.
> 1. We have a 2 Node RAC database running
> 2. We are planning to configure a 2 Node RAC standby database
> 3. I understand from the Oracle docs that only one of the Nodes in a
> RAC can be in a managed recovery mode.
> My question is:
> In the above context of one node performing a managed recovery and the
> other node being idle, can we open the second node in a read only mode
> ?. The manual says that I can't open the other node in read only mode
> but why? would like to understand any limitations of the method
> I had raised a TAR and the response from Oracle is
> <Quote>
> It sounds technically possible, but it is not in the product
> today.Recovery is done when the database is in mount state and
> readonly mode needs the database to be in open state. This state is
> linked to the database and not the instance. So, basically, it sounds
> like an potential enhancement request for future releases.
> <Unquote>
> Thank you for your time
> Best Regards
> Sriram Kumar
> --
> //


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