| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | John Lister <john(dot)lister-ps(at)kickstone(dot)com>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: controlling autovacuum during the day. |
| Date: | 2008-12-17 15:29:03 |
| Message-ID: | 20081217152903.GA37436@winnie.fuhr.org |
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| Lists: | pgsql-admin |
On Wed, Dec 17, 2008 at 09:47:23AM -0500, Tom Lane wrote:
> "John Lister" <john(dot)lister-ps(at)kickstone(dot)com> writes:
> > Cheers for the quick reply. I've tweaked them quite a bit, but we have quite
> > a few heavily updated tables that i'd like vacuuming to keep them in check.
> > Unfortunately the autovacuum does a FULL vacuum every so often locking the
> > tables for quite a long time, i'd like to move these to the evening if
> > possible.
>
> Huh? Autovacuum *never* does VACUUM FULL.
Perhaps autovacuum is shrinking the table after finding lots of empty
pages at the end, as in what VACUUM VERBOSE is logging here:
INFO: "foo": truncated 11944384 to 8877366 pages
I think this acquires an AccessExclusiveLock. I've seen this take
hours in the case of a table with a lot of empty pages.
--
Michael Fuhr
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