Re: To ODA or Not?
Date: Sat, 28 Mar 2015 16:09:12 -0400
Message-ID: <CAAaXtLB8M3xUSVCYiW2QXimu5GdXJ1oc465thWwO5u8iW8v-Qg_at_mail.gmail.com>
That is always how I have understood it to work.
This is what (I am told) distinguished RAC One-Node from RAC proper. There is never more than one instance in a One-Node setup (running or not running). The one and only database instance gets moved from node to node as the need arises.
And this is why I get nervous about "active-passive" clusters built on CRS. They look like a duck, they quack like a duck, and so during an audit, I would expect them to cost the same as a duck. Plus back support and penalties.
The one distinction between the two (again, I am told) is that with RAC one-node, the database is fully "RAC-ready", and a second instance *can* be added without downtime.
Its been a *long* time since I have needed to worry about any of this though, and I have never enjoyed the privilege of having a customer who was willing to *pay* for RAC One-Node (meaning I have never actually used it). So I will bow out of the conversation here.
On Sat, Mar 28, 2015 at 3:59 PM, Andrew Kerber <andrew.kerber_at_gmail.com> wrote:
> The Oracle SID is the same on both servers in all the RAC One Node
> installations I have done. The database storage is shared, and if the
> instance on node 1 goes down, it comes up on node 2. With the same name.
>
> On Sat, Mar 28, 2015 at 2:04 PM, Seth Miller <sethmiller.sm_at_gmail.com>
> wrote:
>
>> RAC One Node is not free. Nor does it have anything to do with
>> Clusterware. Nor does it have anything to do with MySQL. Nor is the
>> ORACLE_SID the same on all cluster nodes. I think you may be confused by
>> what RAC One Node is.
>>
>> RAC One Node allows a connection failover between two or more active
>> instances (temporarily) exactly the same as RAC. There is no way to achieve
>> this with active-passive clustering. A database is one of RAC, RAC One Node
>> or Single Instance. They are all mutually exclusive.
>>
>> Seth Miller
>>
>> On Sat, Mar 28, 2015 at 11:34 AM, Mladen Gogala <
>> dmarc-noreply_at_freelists.org> wrote:
>>
>>> On 03/28/2015 01:52 AM, MARK BRINSMEAD wrote:
>>>
>>>> When did RAC One Node become "free"? Its been a while, but the last
>>>> time I checked, it cost something like $5500 ($11,000?) per processor. It
>>>> certainly wasn't "free". (Although that doesn't mean it isn't now, I
>>>> guess. I have not looked at a pr
>>>>
>>> Hi Mark,
>>> Clusterware is free. You can install clusterware without paying and use
>>> it to fail-over MySQL service. Oracle licenses are not free.
>>>
>>>
>>> --
>>> Mladen Gogala
>>> Oracle DBA
>>> http://mgogala.freehostia.com
>>>
>>> --
>>> http://www.freelists.org/webpage/oracle-l
>>>
>>>
>>>
>>
>
>
> --
> Andrew W. Kerber
>
> 'If at first you dont succeed, dont take up skydiving.'
>
-- http://www.freelists.org/webpage/oracle-lReceived on Sat Mar 28 2015 - 21:09:12 CET