| From: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: COMMIT NOWAIT Performance Option |
| Date: | 2007-02-27 23:59:41 |
| Message-ID: | 20070227235941.GQ51916@nasby.net |
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| Lists: | pgsql-hackers |
On Tue, Feb 27, 2007 at 05:18:28PM -0500, Bruce Momjian wrote:
> Jim C. Nasby wrote:
> > On Mon, Feb 26, 2007 at 10:56:58PM +0000, Simon Riggs wrote:
> > > 2. remove fsync parameter
> >
> > Why? Wouldn't fsync=off still speed up checkpoints? ISTM you'd still
> > want this for things like database restores.
>
> I think we will remove fsync in favor of the new delay, and allow -1 to
> be the same behavior as fsync off.
Well, presumably we'd still allow fsync for some number of versions...
Actually, I don't know that combining both settings is a wise move. The
delay should still provide crash protection, whereas with fsync=off
you've got absolutely no protection from anything. That's a huge
difference, and one that IMHO warrants a separate setting (and a big,
fat WARNING in the comment for that setting).
--
Jim Nasby jim(at)nasby(dot)net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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