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Re: advancing snapshot's xmin

From: Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Neil Conway" <neilc(at)samurai(dot)com>, "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>
Subject: Re: advancing snapshot's xmin
Date: 2008-03-26 16:05:33
Message-ID: 200803261705.36443.dfontaine@hi-media.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Le mercredi 26 mars 2008, Tom Lane a écrit :
> Dimitri Fontaine <dfontaine(at)hi-media(dot)com> writes:
> > Le mercredi 26 mars 2008, Tom Lane a écrit :
> >> whenever the number of active snapshots goes to zero
> > Does this ever happen?
> Certainly: between any two commands of a non-serializable transaction.

Oh, it's a transaction scope snapshot when I though about cluster global 
snapshots. Thanks a lot for explaining, and sorry for disturbing! :)

-- 
dim

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