| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com>, David Steele <david(at)pgmasters(dot)net>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Sokolov Yura <y(dot)sokolov(at)postgrespro(dot)ru>, Stas Kelvich <s(dot)kelvich(at)postgrespro(dot)ru>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] logical decoding of two-phase transactions |
| Date: | 2018-07-23 16:11:13 |
| Message-ID: | CA+TgmobpdQ-ZU_+rUJ3MAop5TcjPQ9DQyd2MazLC3ROe=DySJQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jul 19, 2018 at 3:42 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> I don't think this reasoning actually applies for making HOT pruning
> weaker as necessary for decoding. The xmin horizon on catalog tables is
> already pegged, which'd prevent similar problems.
That sounds completely wrong to me. Setting the xmin horizon keeps
tuples that are made dead by a committing transaction from being
removed, but I don't think it will do anything to keep tuples that are
made dead by an aborting transaction from being removed.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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