| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Petr Jelinek <petr(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Steve Singer <steve(at)ssinger(dot)info>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Jaime Casanova <jaime(at)2ndquadrant(dot)com> |
| Subject: | Re: tracking commit timestamps |
| Date: | 2014-11-25 15:30:33 |
| Message-ID: | 20141125153032.GH1639@alvin.alvh.no-ip.org |
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| Lists: | pgsql-hackers pgsql-www |
Petr Jelinek wrote:
> On 25/11/14 16:23, Alvaro Herrera wrote:
> >Robert Haas wrote:
> >>Maybe 0 should get translated to a NULL return, instead of a bogus timestamp.
> >
> >That's one idea --- surely no transaction is going to commit at 00:00:00
> >on 2000-01-01 anymore. Yet this is somewhat discomforting.
>
> I solved it for xids that are out of range by returning -infinity and then
> changing that to NULL in sql interface, but no idea how to do that for
> aborted transactions.
I guess the idea is that we just read the value from the slru and if it
exactly matches allballs we do the same -infinity return and translation
to NULL. (Do we really love this -infinity idea? If it's just an
internal API we can use a boolean instead.)
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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