linux-kernel - Re: [sqlite] light weight write barriers

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Message-ID: <20121105220440.GB25378@thunk.org>
Date:	Mon, 5 Nov 2012 17:04:40 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Pavel Machek <pavel@....cz>
Cc:	david@...g.hm, Nico Williams <nico@...ptonector.com>,
	General Discussion of SQLite Database 
	<sqlite-users@...ite.org>, ????????? Yang Su Li <suli@...wisc.edu>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>, drh@...ci.com
Subject: Re: [sqlite] light weight write barriers

On Mon, Nov 05, 2012 at 09:03:48PM +0100, Pavel Machek wrote:
> > Well, using data journalling with ext3/4 may do what you want.  If you
> > don't do any fsync, the changes will get written every 5 seconds when
> > the automatic journal sync happens (and sub-4k writes will also get
> 
> Hmm. But that would need setting journalling mode per-file, no?
> 
> Like, make it journal data for all the databases, but keep normal mode
> for rest of system...

You can do that, using "chattr +j file.db".  It's apparently not a
well known feature of ext3/4....

						- Ted
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