Re: Converting WAL to SQL

On Tue, Jan 4, 2022 at 10:47:47AM -0300, Fabrízio de Royes Mello wrote:
>
> On Tue, Jan 4, 2022 at 9:22 AM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
> >
> > On Wed, Dec 29, 2021 at 08:50:23AM -0300, Fabrízio de Royes Mello wrote:
> > > Try this:
> > > https://github.com/michaelpq/pg_plugins/tree/main/decoder_raw
> >
> > You may want to be careful with this, and I don't know if anybody is
> > using that for serious cases so some spots may have been missed.
> >
>
> I used it in the past during a major upgrade process from 9.2 to 9.6. 
>
> What we did was decode the 9.6 wal files and apply transactions to the
> old 9.2 to keep it in sync with the new promoted version. This was our
> "rollback" strategy if something went wrong with the new 9.6 version.

How did you deal with the issue that SQL isn't granular enough (vs.
row-level changes) to reproduce the result reliably, as outlined here?

https://momjian.us/main/blogs/pgblog/2019.html#March_6_2019

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Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

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