| From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Subject: | Re: Freeze avoidance of very large table. |
| Date: | 2015-10-05 14:03:33 |
| Message-ID: | CAHGQGwH9WCS817rs=DYqw9=UbxBrZ7iyw33tqgpLgj4zP0v3aA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Oct 2, 2015 at 8:14 PM, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>> +#define Anum_pg_class_relallfrozen 12
>> Why is pg_class.relallfrozen necessary? ISTM that there is no user of it now.
>
> The relallfrozen would be useful for user to estimate time to vacuum
> freeze or anti-wrapping vacuum before being done them actually.
> (Also this value is used on regression test.)
> But this information is not used on planning like relallvisible, so it
> would be good to move this information to another system view like
> pg_stat_*_tables.
Or make pgstattuple and pgstattuple_approx report even the number
of frozen tuples?
Regards,
--
Fujii Masao
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