Re: controlling autovacuum during the day.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Dec 17, 2008 at 09:47:23AM -0500, Tom Lane wrote:
> "John Lister" <john.lister-ps@xxxxxxxxxxxxx> 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

-- 
Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-admin

[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux