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Re: hot standby documentation

From: Joshua Tolley <eggyknap(at)gmail(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pgsql-docs <pgsql-docs(at)postgresql(dot)org>
Subject: Re: hot standby documentation
Date: 2010-06-22 23:04:03
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Lists: pgsql-docs
On Tue, Jun 22, 2010 at 02:24:55PM -0400, Robert Haas wrote:
> On Tue, Jun 22, 2010 at 8:56 AM, Joshua Tolley <eggyknap(at)gmail(dot)com> wrote:
> >> -    Queries executed on the standby will be correct with regard to the transactions
> >> -    that had been recovered at the start of the query, or start of first statement
> >> -    in the case of serializable transactions. In comparison with the primary,
> >> -    the standby returns query results that could have been obtained on the primary
> >> -    at some moment in the past.
> >> +    Queries executed on the standby will see a view of the database that
> >> +    existed on the master at some moment in the past.
> >
> > Is it really that non-deterministic? /me admits not having followed that
> > discussion. Although the original version is pretty complex, it gives the user
> > some feel for the particular moment in the past that their snapshot will
> > represent. If the original is incorrect, it would be nice to replace it with
> > something that doesn't suggest the user might end up with a snapshot from last
> > week.
> I had another go at this.

Much better, IMO.

Joshua Tolley / eggyknap
End Point Corporation

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