Re: Excessive vacuum times

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От Jim C. Nasby
Тема Re: Excessive vacuum times
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Msg-id 20051213034401.GT54639@pervasive.com
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Ответ на Re: Excessive vacuum times  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Excessive vacuum times  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Mon, Dec 12, 2005 at 06:26:37PM -0500, Tom Lane wrote:
> Wes <wespvp@syntegra.com> writes:
> > The problem was determined to be due to the fact that indexes are vacuumed
> > in index order, not in disk storage order.  I don't see anything about this
> > in the "What's new" for 8.1.  Has anything been done to resolve this?
>
> No.  Avoiding that would require a new approach to
> vacuum-vs-ordinary-indexscan interlocking, so it won't happen until
> someone has a Bright Idea (tm).

Plus there is a TODO to only vacuum pages that are known to have dead
tuples, which should hopefully mean no more index-scans during vacuum as
well. Hopefully this makes it into 8.2...
--
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

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