Re: Safe switchover

Greetings,

* Paul Förster (paul(dot)foerster(at)gmail(dot)com) wrote:
> > On 13. Jul, 2020, at 18:00, Stephen Frost <sfrost(at)snowman(dot)net> wrote:
> > Ah, yes, if you rebuild the replica from a backup (or from the primary),
> > then sure, that's pretty similar to the pgbackrest delta restore, except
> > that when using delta restore we're only rewriting files that have a
> > different SHA checksum after being scanned, and we're pulling from the
> > backup repo anything that's needed and not putting load on the primary.
>
> so, from what I understand, pgbackrest bottom line merely reduces copy overhead in such a particular case. *Kind of* like shutdown primary, rsync, and then startup.

Yes, though unlike rsync, pgbackrest can also run in parallel.. :)

> > There's been a few discussions on -hackers about this, that'd probably
> > be the place to discuss it further..
>
> I'm not hacker, I'm just a DBA. :-)

You're a PG user, so your input is (at least) as valuable regarding
things like this, imv. :)

Thanks!

Stephen