Re: speed up a logical replica setup

On Thu, Jan 4, 2024, at 3:05 AM, Amit Kapila wrote:
> Won't it be a better user experience that after setting up the target
> server as a logical replica (subscriber), it started to work
> seamlessly without user intervention?

If we have an option to control the replication slot removal (default is on),
it seems a good UI. Even if the user decides to disable the replication slot
removal, it should print a message saying that these replication slots can
cause WAL retention.

> > The initial version had an option to stop the subscriber. I decided to
> > remove the option and stop the subscriber by default mainly because (1) it is
> > an extra step to start the server (another point is that the WAL retention
> > doesn't happen due to additional (synchronized?) replication slots on
> > subscriber -- point 2). It was a conservative choice. If point 2 isn't an
> > issue, imo point 1 is no big deal.
> >
>
> By point 2, do you mean to have a check for "max replication slots"?
> It so, the one possibility is to even increase that config, if the
> required max_replication_slots is low.

By point 2, I mean WAL retention (sentence inside parenthesis).

--
Euler Taveira
EDB https://www.enterprisedb.com/