Re: Writing WAL files

On Mon, 5 Oct 2020 at 18:29, Michael Lewis <mlewis(at)entrata(dot)com> wrote:

>
> If you setup a scripted process to update a single row with a timestamptz
> on the source/primary every minute, then you have a very simple consistent
> change and also a way to check on the replica what is current time vs
> last_scripted_update_time if you will and know the approx lag. It would
> seem like a simple albeit hacky solution to you wanting a file every X
> minutes regardless of server activity.
>

I'd thought of going half way to that, and just have a cron job for
psql -c 'CHECKPOINT'
which doesn't give me the quantitative indication I'd get from updating a
timestamp, but doesn't commit me to know about any particular database,
either.

The thing that I find most disconcerting is that the documentation for
Version 12 says checkpoint_timeout is
"Maximum time between automatic WAL checkpoints"

But the change Adrian Klaverd highlighted suggests that this is
deliberately no longer the case,
and I am left wondering what it does, in fact do/mean now.

By the by, top-posting (reply above all quoted text) is discouraged on
> these groups.
>

Indeed. Once upon a time, my signature use to be along the lines of

So what? It's easier for me, so I'll do it!

> > What's wrong with top posting?
> It makes it hard to see comments in context.

Robert.

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