| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Greg Stark <stark(at)mit(dot)edu>, Stephen Frost <sfrost(at)snowman(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Christoph Berg <myon(at)debian(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Craig Ringer <craig(dot)ringer(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: Renaming of pg_xlog and pg_clog |
| Date: | 2016-10-24 14:59:42 |
| Message-ID: | 20161024145942.su5jh4jfnt4hkyrh@alvherre.pgsql |
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| Lists: | pgsql-hackers |
Bruce Momjian wrote:
> On Sat, Oct 22, 2016 at 11:18:28PM +0300, Greg Stark wrote:
> > I think the apt-get behaviour was specifically designed to ensure it
> > couldn't easily be put into a script which I would have said was
> > desirable -- except I suspect there are situations where Postgres
> > database scripts need to do a resetxlog. I'm not sure I can think of
> > any examples offhand but I wouldn't be too surprised.
>
> Yes, pg_upgrade has eight calls to pg_resetxlog to set various value.
There is one difference though, which is that the really destructive
use of pg_resetxlog is the one that removes pg_xlog files. The other
uses that simply set flags in the control file are not as bad -- you can
simply go back to what the original value was. I think we would only
need the obnoxious string requirement in the most dangerous mode.
Alternatively, we could separate the tool in two different executables.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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