Re: Uber migrated from Postgres to MySQL

On 27.07.2016 19:51, Rakesh Kumar wrote:
> 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.
>
>
Sorry, what? You can rollback to previous version of software what you had.

https://docs.oracle.com/cd/E11882_01/server.112/e23633/downgrade.htm#UPGRD007


Alex Ignatov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company