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!


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