Re: Freeze avoidance of very large table.

On Tue, Mar 1, 2016 at 6:51 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> I removed the pgstat stuff.  I'm not sure we want that stuff in that
> form; it doesn't seem to fit with the rest of what's in that view, and
> it wasn't reliable in my testing.  I did however throw together a
> little contrib module for testing, which I attach here.  I'm not sure
> we want to commit this, and at the least someone would need to write
> documentation.  But it's certainly handy for checking whether this
> works.

I think you should commit this. The chances of anyone other than you
and Masahiko recalling that you developed this tool in 3 years is
essentially nil. I think that the cost of committing a developer-level
debugging tool like this is very low. Modules like pg_freespacemap
currently already have no chance of being of use to ordinary users.
All you need to do is restrict the functions to throw an error when
called by non-superusers, out of caution.

It's a problem that modules like pg_stat_statements and
pg_freespacemap are currently lumped together in the documentation,
but we all know that.

-- 
Peter Geoghegan