Re: Log all queries before migration ? - Mailing list pgsql-general

From Melvin Davidson
Subject Re: Log all queries before migration ?
Date
Msg-id CANu8FizyBSrpk5UDTbK8hSZZspZk=KMLwtB-QFpkrBPSeJVriA@mail.gmail.com
Whole thread Raw
In response to Re: Log all queries before migration ?  ("Charles Clavadetscher" <clavadetscher@swisspug.org>)
List pgsql-general


On Wed, Aug 3, 2016 at 10:10 AM, Charles Clavadetscher <clavadetscher@swisspug.org> wrote:
Hello

> -----Original Message-----
> From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of ben.play
> Sent: Mittwoch, 3. August 2016 15:29
> To: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] Log all queries before migration ?
>
> Hi guys,
>
> In fact, I would like to copy a table and then, when everything is finish, execute all inserts and updates since the
> beginning of the copy.
>
> The biggest problem with the log at this time it's the query.
> All my queries are not runnable.

This may help you?

http://laurenz.github.io/pgreplay/

Regards
Charles

>
> When I log, I see this kind of queries :
> "duration: 0.046 ms  parse <unnamed>: UPDATE user SET money = money + $1 WHERE id = $2"
>
> But I would like to have only : "UPDATE user SET money = money + 100 WHERE id = 1281012"
>
> This is our postgresql.conf :
> log_destination = 'csvlog'
> logging_collector = on
> log_min_duration_statement = 0
> log_statement = mod
> log_directory = '/media/hdd/log_queries'
> log_filename='log_insert.log'
> log_file_mode = 0600
> log_error_verbosity = verbose
>
>
> What do we have to change ?
>
> Thank you a lot for your help !
>
>
>
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>
>
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There is no way to record queries and shut down the server at the same time.
That's like saying I want to shut off my car engine but keep driving.

I believe you are looking at the wrong solution.
The best way to migrate and keep all transactions is to use Slony replication.
http://slony.info/adminguide/2.2/doc/adminguide/slony.pdf
http://slony.info/downloads/2.2/

You can start the migration to the new server and when it's finished, you
simply failover to the slave and redirect the url to it.


--
Melvin Davidson
I reserve the right to fantasize.  Whether or not you
wish to share my fantasy is entirely up to you.

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