Re: advancing snapshot's xmin

Dimitri Fontaine <dfontaine@hi-media.com>

From: Dimitri Fontaine <dfontaine@hi-media.com>

To: pgsql-hackers@postgresql.org

Cc: Tom Lane <tgl@sss.pgh.pa.us>, "Heikki Linnakangas" <heikki@enterprisedb.com>, "Neil Conway" <neilc@samurai.com>, "Alvaro Herrera" <alvherre@commandprompt.com>

Date: 2008-03-26T16:05:33Z

Lists: pgsql-hackers

Le mercredi 26 mars 2008, Tom Lane a écrit :
> Dimitri Fontaine <dfontaine@hi-media.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