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From "Sai Pullabhotla" <sai.pullabho...@jmethods.com>
Subject Re: Replicating Derby Database Files
Date Fri, 16 May 2008 12:14:20 GMT
Thanks for the replies, Rick and Narayanan!

I will look into the documentation some more and see if we can use
this feature.

Regards,
Sai Pullabhotla

On Fri, May 16, 2008 at 12:33 AM, Narayanan <V.Narayanan@sun.com> wrote:
> Sai Pullabhotla wrote:
>>
>> Rick,
>>
>> Thanks for the reply. I briefly looked at the 10.4. documentation and
>> it seems that the replication is designed for Derby running as a
>> network server. Is this true?
>>
>
> No it is not true. You can run replication in the embedded mode also.
>>
>> Our application runs Derby in embedded mode and our customers are
>> wanting to replicate the application on a regular basis (as and when
>> any file/data changes) to the HA systems. What would be our options
>> here to keep the Derby database up-to-date on the HA system?
>>
>
> I am worried about what you mean by up to date here. You see replication in
> derby is
> asynchronous, we only promise transaction consistency. You can read some
> more on replication
> in derby here
>
> http://wiki.apache.org/db-derby/ReplicationWriteup
>
> You can replicate an existing embedded database following the steps listed
> here. You will find
> the combination of the documentation in derby and this wiki comprehensive,
> feel free to raise
> any doubts you have.
>
> Narayanan
>>
>> Thanks and Regards,
>> Sai Pullabhotla
>>
>> On Thu, May 15, 2008 at 12:14 PM, Rick Hillegas
>> <Richard.Hillegas@sun.com> wrote:
>>
>>>
>>> Hi Sai,
>>>
>>> Single-node master/slave replication with manual failover was added to
>>> Derby
>>> in version 10.4. You should not try to manually copy a Derby database
>>> which
>>> is in use.
>>>
>>> Hope this helps,
>>> -Rick
>>>
>>> Sai Pullabhotla wrote:
>>>
>>>>
>>>> Hello,
>>>>
>>>> We have a need to replicate Derby Database from the production system
>>>> to the High Availability system. The software we use monitors for any
>>>> file changes on the production system and replicates the changed files
>>>> to the High Availability system. My question is -
>>>>
>>>> Is it safe to copy the Derby data files to another system while the
>>>> database is in use on the source system? Will the database on the
>>>> destination still be usable if we do this?
>>>>
>>>> Thanks & Regards,
>>>>
>>>> --
>>>> Sai Pullabhotla
>>>> www.jMethods.com
>>>>
>>>>
>>>
>>>
>>
>>
>>
>>
>
>



-- 
Sai Pullabhotla
Phone: (402) 408-5753
Fax: (402) 408-6861
www.jMethods.com

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