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Re: Uber migrated from Postgres to MySQL - Mailing list pgsql-general

From Rakesh Kumar
Subject Re: Uber migrated from Postgres to MySQL
Date
Msg-id CAJBB=EWGCO+FnsynY_pE4o4Tdfm4KOb_kyWrT+v-ojwJNW3Ztw@mail.gmail.com
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In response to Re: Uber migrated from Postgres to MySQL  (Bruce Momjian <bruce@momjian.us>)
Responses Re: Uber migrated from Postgres to MySQL  (Bruce Momjian <bruce@momjian.us>)
Re: Uber migrated from Postgres to MySQL  (Alex Ignatov <a.ignatov@postgrespro.ru>)
List pgsql-general
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On Wed, Jul 27, 2016 at 12:47 PM, Bruce Momjian <bruce@momjian.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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