Re: Converting from a 2-node RAC cluster using ASM to a single instance with Oracle Restart.

That's fine for the database, but how do we decouple the cluster. The end result for us would be a single node,  single instance with Oracle Restart. 

    On Friday, 20 October 2017, 12:29, Stefan Knecht <knecht.stefan_at_gmail.com> wrote:  

 Then you won't need any Data Guard shenanigans or anything like that. Set cluster_database and other RAC-specific parameters to false or remove them, shut down, startup, drop excess redo threads.  Done.
Of course you have to check on any specific service configurations to make sure everyone can still connect. Also be aware of applications not properly configured (e.g. using host:port:SID) Stefan

On Fri, Oct 20, 2017 at 5:10 PM, Zabair Ahmed <dmarc-noreply_at_freelists.org> wrote:

Hi Seth, Sorry forgot to say this new single instance will be on the same server as one of the RAC databases. We are trying to reduce our RAC footprint hence the reason going to a single instance.  Thanks

    On Thursday, 19 October 2017, 17:48, Seth Miller <sethmiller.sm_at_gmail.com> wrote:  

 Zabair,
If you are moving from a RAC cluster to another server, the easiest way to do this is to create a new instance on your single instance server and restore a backup from the RAC database. You can reuse the control file or create a new one; the latter probably being the better option so you don't have to delete a bunch of extra online redo logs and remap the data file locations. You will have at least one extra undo tablespace but those can simply be dropped after the restore is complete.

Seth Miller
On Thu, Oct 19, 2017 at 11:08 AM, TJ Kiernan <tkiernan_at_pti-nps.com> wrote:

Good point – I happened to be repurposing one of the nodes to run the single instance, but it’s not technically necessary. -T. J. From: Andrew Kerber [mailto:andrew.kerber_at_gmail. com] Sent: Thursday, October 19, 2017 10:59 AM To: TJ Kiernan
Cc: dmarc-noreply_at_freelists.org; exriscer_at_gmail.com; Oracle-L Freelists Subject: Re: Converting from a 2-node RAC cluster using ASM to a single instance with Oracle Restart. You can run dataguard from RAC to single instance. No need to remove one first.  If you need help with that, let me know. Sent from my iPad On Oct 19, 2017, at 9:44 AM, TJ Kiernan <tkiernan_at_pti-nps.com> wrote: I just got through something very similar.  There isn’t a single document for the process, but you should be able to map it out by, 1.     Remove one node from the cluster,2.     Provision storage for the new instancea.      we split our ASM disks in half as we had the capacity to do so – if you don’t, you’re looking at finding other storage or reusing your diskgroups from the RAC environment.  I’ve heard it can be done, but I’ve never attempted it. 3.     Build your new instance as a Data Guard standby4.     Switchover HTH, T. J. From:oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_ freelists.org]On Behalf Of Zabair Ahmed Sent: Thursday, October 19, 2017 7:37 AM To: exriscer_at_gmail.com; Oracle-L Freelists Subject: Re: Converting from a 2-node RAC cluster using ASM to a single instance with Oracle Restart.  We are using 11.2.0.4 EE. Thanks for the suggestion, will look into it. On Thursday, 19 October 2017, 13:28, Ls Cheng <exriscer_at_gmail.com> wrote: Can you use Data Guard or you are running standard edition? If you can just setup a Data Guard in Sngle Instance and switchover so the downtime is minium BR On Thu, Oct 19, 2017 at 2:02 PM, Zabair Ahmed <dmarc-noreply_at_freelists.org> wrote: Hello,  We are currently on a 2 node 11.2.0.4 RAC cluster  on Redhat 5.9 and wanted to convert this database to a single instance with Oracle Restart running 11.2.0.4.  I would appreciate if someone could point me to the right place for some documentation/notes. I have tried MOS and Oracle documentation  but not have had any luck so far. TIA. Zabair       

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