Alvaro Herrera wrote:
> Excerpts from Jeff Davis's message of mar mar 29 21:27:34 -0300 2011:
> > On Tue, 2011-03-29 at 15:52 -0400, Bruce Momjian wrote:
> > > Does anyone have any other suggestions on how to make sure autovacuum
> > > does not run in freeze mode?
> > Can you run in single user mode?
> I asked the same thing. Apparently the problem is that it would make
> error handling a lot more difficult. I think it would be better to have
> some sort of option to disable autovacuum completely which would be used
> only during pg_upgrade.
Yes, also consider that pg_dumpall assumes psql with its use of
\connect, and I would have to start/stop the single-user backend for
every database change, plus I use psql with ON_ERROR_STOP=on.
I think we have three options:
o find if the use of autovacuum_freeze_max_age is safe, or make
o document that autovacuum_naptime always happens before
autovacuum does anything and set it high
o modify autovacuum to be an enum, with values on/off/disabled
I think the last one makes more sense, and is safer if we need to
backpatch this. Creating a new variable for this would be confusing
because it could conflict with the 'autovacuum' setting.
Also, I am unclear if this is really our bug. At least one of the
systems was on Ubuntu/Debian, and they might both have been, and I know
Debian changes our source code. Where can I find a copy of the diffs
they have made?
I am hearing only second-hand reports of this problem through
Rhodiumtoad on IRC. I don't have IRC access this week so if someone can
get details from him that would help. I think the fix he found was to
pull the clog files off of an old file system backup.
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
+ It's impossible for everything to be true. +
In response to
pgsql-hackers by date
|Next:||From: Robert Haas||Date: 2011-03-30 15:02:08|
|Subject: Re: Process local hint bit cache|
|Previous:||From: Robert Haas||Date: 2011-03-30 14:57:30|
|Subject: Re: gcc 4.6 warnings -Wunused-but-set-variable|