Re: Question about pg_dump + pg_restore + pg_toast

Run the PG12 pg_dump just before the pg_upgrade.

Forward compatibility in maintenance utilities is (usually) guaranteed.
Backwards compatibility (which is what you want)? Not so much.

On Mon, Feb 24, 2025 at 4:31 PM Edwin UY <edwin(dot)uy(at)gmail(dot)com> wrote:

> Yikes, I thought it is alright so long as I use the latest version of
> pg_dump and restore.
> Thanks for the warning.
>
> On Tue, Feb 25, 2025 at 12:35 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
> wrote:
>
>> On Mon, 2025-02-24 at 22:19 +1300, Edwin UY wrote:
>> > We are upgrading this database from v12 to v16 and we want to do a dump
>> of it in case we decided to do a restore from v16 to v12.
>> > SO, after the upgrade, in case we want to rollback to v12, we will do a
>> pg_dump using v16 and then using v12 pg_restore
>>
>> Be warned that downgrade is not supported and restoring the dump to v12
>> might well fail.
>> You might have to manually edit the dump file until you can restore it
>> without errors.
>>
>> Yours,
>> Laurenz Albe
>>
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