Re: Report the number of skipped frozen pages by manual VACUUM

On Fri, Feb 24, 2017 at 1:30 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> Hi all,
>
> The autovacuum reports the number of skipped frozen pages to the
> VACUUM output. But these information is not appeared by manual VACUUM.
> This information is useful for the user to check efficiency of VACUUM.
>
> Attached patch add this information to VACUUM output.
>
> * Example
> =# VACUUM VERBOSE test
> INFO:  vacuuming "public.test"
> INFO:  "test": found 0 removable, 56 nonremovable row versions in 1
> out of 45 pages
> DETAIL:  0 dead row versions cannot be removed yet.
> There were 0 unused item pointers.
> Skipped 0 pages due to buffer pins, 44 frozen pages.
> 0 pages are entirely empty.
> CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s.
> VACUUM
>
> I'll register it to next CF.
>

Added this patch to CF 2017-03.

Regards,

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