Re: ALTER TABLE on system catalogs

On 2018-09-28 16:06:30 -0300, Alvaro Herrera wrote:
> On 2018-Aug-21, Andres Freund wrote:
>
> > On 2018-08-21 17:04:41 +0200, Peter Eisentraut wrote:
> >
> > > That doesn't solve the original problem, which is being able to set
> > > reloptions on pg_attribute, because pg_attribute doesn't have a toast
> > > table but would need one according to existing rules.
> >
> > I still think it's wrong to work around this than to actually fix the
> > issue with pg_attribute not having a toast table.
>
> FWIW I'm still bothered by the inability to move pg_largeobject to a
> different tablespace, per
> https://postgr.es/m/20160502163033.GA15384@alvherre.pgsql
> While that needs even more work (preservability across pg_dump for one),
> this item here would be one thing to fix.
>
> Also, I don't quite understand what's so horrible about setting
> autovacuum options for system catalogs, including those that don't have
> toast tables. That seems a pretty general feature that needs fixing,
> too.

I'm not sure what that has to do with my point? What I'm saying is that
we shouldn't have some weird "should have a toast table but doesn't"
exception, not that we shouldn't allow any sort of DDL on catalogs.

Greetings,

Andres Freund