Re: pgbasebackup necessary for master slave change?

On Thu, Dec 8, 2016 at 10:33 AM, Subhankar Chattopadhyay <
subho(dot)atg(at)gmail(dot)com> wrote:

> Hi,
>
> Few days back I had asked if it is needed to to pg_basebackup for
> every database update. From John I understood that it is unnecessary
> and if the slave is syncing, even if it is catching up, it would be
> able to sync without doing pg_basebackup. This is working also for me.
>
> However, for a failover scenario, where a master goes down, and I make
> the slave as master, and then when the old master comes back as a
> slave again, if I don't take pg_basebackup from the new master, it
> cannot follow the new master. This is kind of an overhead. Is there a
> way I can make the old master follow the new master without having to
> do full backup?
>

Depending on your version and circumstance, pg_rewind may address your
problem.
https://www.postgresql.org/docs/9.5/static/app-pgrewind.html

>
>
>
> Subhankar Chattopadhyay
> Bangalore, India
>
>
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