Re: Uber migrated from Postgres to MySQL

From: Rakesh Kumar <rakeshkumar464a3(at)gmail(dot)com>
To:
Cc: PostgreSQL General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Uber migrated from Postgres to MySQL
Date: 2016-07-27 16:51:40
Message-ID: CAJBB=EWGCO+FnsynY_pE4o4Tdfm4KOb_kyWrT+v-ojwJNW3Ztw@mail.gmail.com
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On Wed, Jul 27, 2016 at 12:47 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:

> Yes. I was saying I don't know how to improve pg_upgrade to address it.

This problem is there even in oracle/db2/sqlserver. None of them allow
rollback to the lower version
unless it is a minor version upgrade. Major version upgrade almost
definitely involves change in transaction log
(WAL) structure and hence no rollback.

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