Re: Questions on Upgrading PostgreSQL from 15.0 to 15.9 and Setting Up Streaming Replication

On Sun, Nov 24, 2024 at 12:06 PM Christophe Pettus <xof@thebuild.com> wrote:

> > On Nov 24, 2024, at 09:03, Subhash Udata <subhashudata@gmail.com> wrote:
> > When we shut down the standby, upgrade it, and then start it back up,
> will the replication automatically resume from the primary to the standby?
>
> Assuming that the standby has access to any WAL generated during the
> shutdown (either still in the primary's WAL directory, or via an archive
> using archive_command), yes.  If you are not using a WAL archive using
> archive_command, you will want to make sure your wal_keep_size parameter is
> set high enough that required WAL segments aren't recycled during the
> standby's downtime.


Doesn't the existence of a replication slot force PG to retain WAL files
when replication is broken?

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