Re: Avoiding adjacent checkpoint records

On 7 June 2012 14:59, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
>> there is no guarantee that we'll manage to reach a database state
>> that is consistent with data already flushed out to disk during
>> the last checkpoint.
>
> Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
>> I know of real customers who would have suffered real data loss
>> had this code been present in the server version they were using.
>> Checkpoints are the *only* mechanism by which SLRU pages get
>> flushed to disk on a mostly-idle system. That means if something
>> happens to your pg_xlog directory, and you haven't had a
>> checkpoint, you're screwed.

If that is the concern, then its a one line fix to add the missing clog flush.

The other suggestions I've skim read seem fairly invasive at this
stage of the release.

--
 Simon Riggs                   http://www.2ndQuadrant.com/
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