Re: Migration of server

Yes, you're right. Really i don't have too much knowledgement about the
number and complexity of the applications that they have that works with
the database (i only know that they have some PHP applications and Visual
Basic .NET apps), so you are right. In conclusion, you recommend to make an
installation just for testing, and when i check that everything is
allright, install it again? What about just delete the database after
testing and generate another backup from production instance and restore it
on the new instance?

THanks for your answer, Gilberto and Craig.

Regards.

***************************
Oscar Calderon
Analista de Sistemas
Soluciones Aplicativas S.A. de C.V.
www.solucionesaplicativas.com
Cel. (503) 7741 7850

2013/5/16 Craig James <cjames(at)emolecules(dot)com>

> On Thu, May 16, 2013 at 11:04 AM, Oscar Calderon <
> ocalderon(at)solucionesaplicativas(dot)com> wrote:
>
>> Hi everybody, this is my first message in this list. The company where i
>> work is bringing maintenance service of PostgreSQL to another company,
>> and currently they have installed PostgreSQL 9.1.1, and they want to move
>> to 9.3 version when it will come out. So, because the difference of
>> versions, and because it was installed by compiling it (using source code),
>> and because the 9.1.1 installation is in a different directory than the
>> default, they decided to replace 9.1.1 version with 9.3 (no upgrade, but
>> replace it).
>>
>> Currently, they only have one database in production of 2.2 GB with some
>> procedures and triggers. So, my plan to execute this database installation
>> is the next:
>>
>>
>> 1. Install PostgreSQL 9.3 from postgresql repository (
>> yum.postgresql.org) with a different port to avoid interrupt the
>> production PostgreSQL instance operation
>> 2. Tune the database parameters in postgresql.conf, also create the
>> same rules in pg_hba as the production instance, configure log and so on.
>> 3. At the end of the operations day, create a backup of the
>> production database and then restore it into the new instance
>> 4. Test the new instance with the PHP applications that use it and
>> verify that all is in order
>> 5. Stop the old instance and change the port to another port, then
>> change the port of the new instance to 5432 in order to avoid change the
>> network configuration, permissions and so on.
>>
>> But really is the first time that i do that, so i don't know if i'm
>> missing something or there's something wrong about i'm planning to do, so i
>> will appreciate very much if you can guide me about what steps i have to do
>> exactly and considerations during this process.
>>
>
> I would expand step 4 into a much longer period. Say, do steps 1..3 (you
> don't even have to stop your services ... do it during a low-traffic
> period), then spend a few days on step 4 to ensure that all of your
> applications work and that you don't have any queries that have problems.
> Unless your application is really simple, it will take more than an hour or
> two to ensure that the migration will go well.
>
> Once you're convinced that everything will work, discard the new 9.3
> database and start over again at step 1, and this time complete through
> step 5.
>
> Craig
>
>>
>> Regards.
>> ***************************
>> Oscar Calderon
>> Analista de Sistemas
>> Soluciones Aplicativas S.A. de C.V.
>> www.solucionesaplicativas.com
>> Cel. (503) 7741 7850
>>
>
>