On 11/12/22 22:07, Tom Lane wrote:
> Ron <ronljohnsonjr@gmail.com> writes:
>> On 11/11/22 23:09, Adrian Klaver wrote:
>>> 2) For your explanation above, pg_dump from 9.4(5432) to pg_restore
>>> 12(5433) the issue would be ...\9.4\bin\pg_dump.exe of 9.4 and pg_restore
>>> of said dump file to version 12. When moving up in version you need to use
>>> the newer version of pg_dump(...\12\bin\pg_dump.exe) to dump the 9.4
>>> instance and then the version 12 pg_restore to the 12 instance. Both
>>> programs are backwards compatible, not forwards compatible.
>
>> Unless there's some bug (you're running a /really/ old version of 9.4), you
>> might be able to get away with using the 9.4 binary.
>
> Yeah. The recommendation to use the later version's pg_dump for a
> migration is in the nature of "this is best practice", not "this is
> the only way that will work". The argument for it is that the older
> pg_dump might have bugs that are fixed in the newer version. But
> such bugs are rare, so usually it'll work fine to use the older one.
> We do endeavor to make sure that older dump output will load into
> newer versions, because in disaster-recovery scenarios an older
> dump might be all you have.
I stand corrected.
I should have read the Notes here:
https://www.postgresql.org/docs/current/app-pgdump.html
>
> regards, tom lane
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
