| From: | Alex Ignatov <a(dot)ignatov(at)postgrespro(dot)ru> |
|---|---|
| To: | Rakesh Kumar <rakeshkumar464a3(at)gmail(dot)com> |
| Cc: | PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Uber migrated from Postgres to MySQL |
| Date: | 2016-07-28 14:59:28 |
| Message-ID: | cd325a41-24b1-dc61-b2aa-5531bfa6208a@postgrespro.ru |
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| Lists: | pgsql-general |
On 28.07.2016 17:50, Rakesh Kumar wrote:
> On Thu, Jul 28, 2016 at 10:38 AM, Alex Ignatov <a(dot)ignatov(at)postgrespro(dot)ru> wrote:
>
>> 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
> Not so fast. This requires the db to be set in compatibility mode of
> the lower version. Once that is removed, no downgrade is possible.
>
> Also starting from Oracle 12 this downgrade option has been removed.
> That is, you can't upgrade in-place from Or 11 to 12 and then
> downgrade back. The only supported way is the restore from an old
> backup (which is true for all products). I don't work in Oracle, but
> got this clarified by someone who is an Oracle dba.
>
>
Not true -
https://docs.oracle.com/database/121/UPGRD/downgrade.htm#UPGRD007
About compatible params you are right but downgrade is possible from 12c.
Alex Ignatov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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