Re: PostgreSQL Downgrades

It was the data changes I was concerned about: Any
additions/deletions/modifications done on the database while it's using
the 9.x binaries that should be brought back if we downgrade to the 8.x
version.

I think the only way would be to "manually" dump the data using custom
psql commands instead of using pg_dump/pg_dumpall.

Thanks, Adrian.

On 4/5/13 6:35 PM, "Adrian Klaver" <adrian(dot)klaver(at)gmail(dot)com> wrote:

>On 04/05/2013 03:33 PM, Pete Wall wrote:
>> Is it possible to downgrade PostgreSQL by a major version?
>>
>> If I want to upgrade a PG database from 8.x to 9.x, I have to dump the
>> db, install the new binaries and import the dump file. This works fine
>> going forward, but what if I need to rollback my changes? I cannot dump
>> the 9.x database and import it with 8.x binaries, because the 9.x dump
>> contains keywords that the old binaries don't understand (e.g.
>>REPLICATION).
>>
>> I could import the original 8.x dump file again, but then I've lost any
>> changes made when using the new binaries.
>
>What changes, data/schema or both?
>
>>
>> Is there a supported way to downgrade PostgreSQL by major versions?
>
>Not that I know of.
>
>>
>> Thank you,
>> -Pete
>
>
>--
>Adrian Klaver
>adrian(dot)klaver(at)gmail(dot)com