Re: Re: reloption to prevent VACUUM from truncating empty pages atthe end of relation

On Mon, Apr 8, 2019 at 9:52 AM Fujii Masao <masao.fujii@gmail.com> wrote:
>
> On Sat, Apr 6, 2019 at 2:04 AM Robert Haas <robertmhaas@gmail.com> wrote:
> >
> > On Thu, Apr 4, 2019 at 9:19 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> > > As INDEX_CLEANUP option has been added by commit a96c41f, the new
> > > option for this feature could also accept zero or one boolean
> > > argument, that is SHRINK_TABLE [true|false] and true by default.
> > > Explicit options on VACUUM command overwrite options set by
> > > reloptions. And if the boolean argument is omitted the option depends
> > > on the reloptions.
> >
> > Yes, I think that's how it should work, because that's how the other
> > option works, and there's no compelling reason to be consistent.
> >
> > My preference is for "truncate" over "shrink".
>
> +1
>
> Attached is the updated version of the patch.
> I just replaced "shrink" with "truncate" and rebased the patch
> on the master.

Thank you for updating the patch! "vacuum_truncate" option would be
more consistent with vacuum_index_cleanup option rather than
"vacuum_truncate_enabled' option?

>  I'm thinking to commit this patch at first.
> We can change the term and add the support of "TRUNCATE" option
> for VACUUM command later.

+1

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center