| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, "Hackers (PostgreSQL)" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: detecting binary backup in progress |
| Date: | 2013-06-01 08:21:08 |
| Message-ID: | 20130601082108.GF3955@alap2.anarazel.de |
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| Thread: | |
| Lists: | pgsql-hackers |
On 2013-06-01 17:05:57 +0900, Michael Paquier wrote:
> On Sat, Jun 1, 2013 at 4:55 AM, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>wrote:
>
> > Heikki Linnakangas wrote:
> >
> > > The manual says:
> > > >pg_is_in_backup() bool True if an on-line exclusive backup is
> > still in progress.
> > >
> > > So clearly that is intentional. That could use some rephrasing,
> > > though; a layman won't know what an "exclusive backup" is.
> >
> > Heck, I don't understand what it is either.
> >
> Same here. Does it mean taking a backup not with pg_basebackup but by
> executing yourself external operations between pg_start/stop_backup calls?
Basically yes. pg_start/stop_backup places the backup label into the data
directory itself so there can only be one of them at a time since it has
to have a fixed name. With the streaming protocol the backup label is
only added to the streamed data, so there can be multiple ones at the
same time.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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