Re: Parallelizing startup with many databases

On Sat, 3 Jan 2026 at 20:09, Andreas Karlsson <andreas(at)proxel(dot)se> wrote:
>
> On 1/3/26 1:58 AM, Jelte Fennema-Nio wrote:
> > PS It took me way to long to find that setting. I think we should move
> > it from the error handling docs page to the page with all of the other
> > recovery settings. https://www.postgresql.org/docs/current/runtime-
> > config-wal.html#RUNTIME-CONFIG-WAL-RECOVERY <https://www.postgresql.org/
> > docs/current/runtime-config-wal.html#RUNTIME-CONFIG-WAL-RECOVERY>
>
> I agree that it is currently not in exactly a great location but the
> issue is that the "Recovery" section is a subsection of the "WAL"
> section, and syncing the data directory is only loosely related to WAL.
> One could argue it is related to WAL as in that it is something done
> before replaying WAL but it is not an obvious location either. Or is it?

<Moving this discussion to pgsql-docs, with accompanying patch>

While the setting is not strictly related to WAL it still seems a much
more natural place than the "Error handling" page. Especially because of
the description of this subheading:

> This section describes the settings that apply to recovery in general,
> affecting crash recovery, streaming replication and archive-based
> replication.

The only recovery related GUC that exists that's not on the WAL page is
recovery_min_apply_delay, which is under the Replication->Standby
section. Since that GUC is only valid on standbys that seems like a
sensible choice.