public inbox for [email protected]
help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: Marc G. Fournier <[email protected]>
Cc: Justin Clift <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: [pgsql-www] pg_autovacuum is nice ... but ...
Date: Sun, 28 Nov 2004 21:03:54 -0500 (EST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
Should I add a TODO to warn if FSM values are too small? Is that doable?
---------------------------------------------------------------------------
Marc G. Fournier wrote:
>
> Moved to -hackers where this belongs :)
>
> On Fri, 5 Nov 2004, Justin Clift wrote:
>
> > Tom Lane wrote:
> > <snip>
> >> Yup. 20000 < 23072, so you're losing some proportion of FSM entries.
> >> What's worse, the FSM relation table is maxed out (1000 = 1000) which
> >> suggests that there are relations not being tracked at all; you have
> >> no idea how much space is getting leaked in those.
> >>
> >> You can determine the number of relations potentially needing FSM
> >> entries by
> >> select count(*) from pg_class where relkind in ('r','i','t');
> >> --- sum over all databases in the cluster to get the right result.
> >>
> >> Once you've fixed max_fsm_relations, do vacuums in all databases, and
> >> then vacuum verbose should give you a usable lower bound for
> >> max_fsm_pages.
> >
> > Would making max_fsm_relations and max_fsm_pages dynamically update
> > themselves whilst PostgreSQL runs be useful? Sounds like they're the
> > kind of things that many people would receive maximum benefit if
> > PostgreSQL altered these settings as needed itself.
>
> I'm not sure if I like this one too much ... but it would be nice if
> something like this triggered a warning in the logs, maybe a feature of
> pg_autovacuum itself?
>
> ----
> Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
> Email: [email protected] Yahoo!: yscrappy ICQ: 7615664
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
>
--
Bruce Momjian | http://candle.pha.pa.us
[email protected] | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
view thread (24+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected], [email protected]
Subject: Re: [pgsql-www] pg_autovacuum is nice ... but ...
In-Reply-To: <[email protected]>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox