Re: [GENERAL] [HACKERS] Hot Standby utility and administrator functions

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, pgadmin-hackers(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] [HACKERS] Hot Standby utility and administrator functions
Date: 2008-10-20 20:56:06
Message-ID: 1224536166.3808.864.camel@ebony.2ndQuadrant
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On Mon, 2008-10-20 at 17:44 -0300, Alvaro Herrera wrote:
> Simon Riggs escribió:
> >
> > On Mon, 2008-10-20 at 16:22 -0400, Robert Haas wrote:
> > > > * pg_last_recovered_xact_xid()
> > > > Will throw an ERROR if *not* executed in recovery mode.
> > > > returns bigint
> > > >
> > > > * pg_last_completed_xact_xid()
> > > > Will throw an ERROR *if* executed in recovery mode.
> > > > returns bigint
> > >
> > > Should these return xid?
> >
> > Perhaps, but they match txid_current() which returns bigint.
> > http://developer.postgresql.org/pgdocs/postgres/functions-info.html
>
> That's been "extended with an epoch counter" per the docs; I don't think
> that's appropriate for the new functions, is it?

I assumed it was, so you can subtract them easily.

It can be done either way, I guess. Happy to provide what people need. I
just dreamed up a few that sounded useful.

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support

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