Re: HOT and autovacuum

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От Alvaro Herrera
Тема Re: HOT and autovacuum
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Msg-id 20080304112044.GA4755@alvh.no-ip.org
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Ответ на Re: HOT and autovacuum  (Tom Lane <tgl@sss.pgh.pa.us>)
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Tom Lane wrote:
> Alvaro Herrera <alvherre@commandprompt.com> writes:
> > I'm seeing a 8.3 database whose autovacuum-initiated vacuums are being
> > cancelled and I am not sure of the cause.  I am wondering if a HOT
> > cleanup round on a page could try to acquire locks on it that would
> > conflict with autovacuum (basically anything that conflicts with a
> > vacuum lock).  This would cause autovacuum to commit hara-kiri.
> 
> This is nonsense, no?  A buffer cleanup lock is an LWLock not a lock
> manager lock.

Yeah, I realized that after awhile.  There must be something else they
are doing.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support


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