Re: Enhance 'pg_createsubscriber' to retrieve databases automatically when no database is provided.

On Fri, Jan 24, 2025 at 7:28 PM Ashutosh Bapat
<ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
>
> On Fri, Jan 24, 2025 at 8:14 AM Peter Smith <smithpb2250(at)gmail(dot)com> wrote:
> >
> > On Thu, Jan 23, 2025 at 10:33 PM Ashutosh Bapat
> > <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
> > >
> > > On Wed, Jan 22, 2025 at 7:29 PM Shubham Khanna
> > > <khannashubham1197(at)gmail(dot)com> wrote:
> > > >
> > > > Hi all,
> > > >
> > > > I am writing to propose an enhancement to the pg_createsubscriber
> > > > utility that enables it to automatically fetch all non-template
> > > > databases from the publisher when no specific databases are specified
> > > > by the user. This was an open item from [1] that was planned for
> > > > future implementation. The attached patch has the changes for the
> > > > same.
> > >
> > > I think the feature will be useful, but UI might cause some unwanted
> > > results. If a user forgets to specify -d option, the utility will
> > > create subscriptions to all the databases, some of which may or may
> > > not have the publications. I think it's better to provide an option to
> > > specify all databases explicitly (e.g. --all-databases).
> > >
> >
> >
> > +1 better to be safe.
> >
> > Instead of a new switch, how about changing the --database switch to
> > accept a pattern (like pg_dump --schema does [1])
> >
> > Then "all databases" would be specified something like --database = *
> >
>
> WFM but that will be more work than what's in the patch.
>

OK, what if, instead of full pattern matching it could recognise just
one special dbname value of '*' (meaning "all")

So, "all databases" could still be specified as --database = *

The implementation would be almost no more work than the current
patch, while at the same time leaving it open to be extended as a
pattern if needed in the future. Or, is it too hacky?

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Kind Regards,
Peter Smith.
Fujitsu Australia