SQLite and ext3 journalling mode
Ric Wheeler
ricwheeler at gmail.com
Wed Dec 8 17:07:32 UTC 2010
On 12/08/2010 11:56 AM, Richard Hipp wrote:
>
>
> On Wed, Dec 8, 2010 at 11:25 AM, Ric Wheeler <ricwheeler at gmail.com
> <mailto:ricwheeler at gmail.com>> wrote:
>
> On 12/08/2010 06:52 AM, Dan Kennedy wrote:
>
>
> Thanks. But to be clear, is data=ordered better than data=writeback
> wrt. data integrity following a power failure?
>
> Regards,
> Dan.
>
>
> Data integrity can mean a couple of different things.
>
> If you are file system meta-data centric (i.e., a file system developer or
> just worried about having to run fsck after a crash to repair the file
> system), then both options *should* be equivalent.
>
> If you are one of those annoying users who define data integrity to
> include those annoying details like will my file have garbage in it after
> a crash that will make my DB or other app puke, then data ordered is
> clearly more robust.
>
>
> Thanks, Ric. Yes, we are numbered among the "annoying users". Based on what
> you are telling us, we'll recommend that people use data=ordered, barrier=1
> for maximum data reliability in the face of power loss.
That is what I do as well - there are use cases and users that prefer the lower
latency and can accept the trade offs that come with data writeback or
non-barrier use, but I certainly think most users would be better using the
settings you have above.
Good luck!
Ric
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