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From Tore Halset <hal...@pvv.ntnu.no>
Subject Re: [OT] sync large db over slow network
Date Tue, 03 Oct 2006 09:06:58 GMT
Thanks, I will have another look at Slony. It does not handle oid  
blobs, but I guess we can use bytea blobs as our blobs are not that  
big. - we do not need streaming at the jdbc-level.

  - Tore.

On Oct 2, 2006, at 18:30, Michael Gentry wrote:

> If you are switching to PostgreSQL, perhaps this would work for you?
>
> http://gborg.postgresql.org/project/slony1/projdisplay.php
>
> /dev/mrg
>
> PS. I have no hands-on experience with it.  I have just heard of it  
> many times.
>
>
>
> On 10/2/06, Tore Halset <halset@pvv.ntnu.no> wrote:
>> Hello.
>>
>> We have a large database for a cayenne server application. The
>> database engine is currently MS SQL Server, but we will perhaps
>> switch over to PostgreSQL at some point in time.
>>
>> For disaster recovery we want to have a mirrored system somewhere
>> else in the world. It is ok if the mirrored system are updated every
>> 15. minute or so. The data volume are too large to be able to do a
>> full dump/restore of the database that often. The content of the
>> database do not change that much every 15. minute.
>>
>> I have looked at sequoia. It injects at the jdbc-level and issue all
>> delete/update/insert-statements in the backup database as well as the
>> main database. I am afraid that the extra level om complexity will
>> degrade the main service. Anyone here have experience with sequoia
>> over network links that may be down from time to time..? I wanted to
>> have one controller on each site, but have read on the mail list that
>> controllers should have a reliable network between them.
>>
>> I could do some things myself at the jdbc-level to send over changes
>> to the database. Small tables could be mirrored completely and have
>> some smart logic for larger tables. Perhaps use dataport and/or ROP.
>>
>> Any ideas?
>>
>> Regards,
>>   - Tore.
>>


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