Re: Getting even more insert performance (250m+rows/day)

On Wed, May 24, 2006 at 04:09:54PM -0400, Daniel J. Luke wrote:
> On May 24, 2006, at 4:03 PM, Steinar H. Gunderson wrote:
> >Have you tried fiddling with the checkpointing settings? Check your
> >logs --
> >if you get a warning about checkpoints being too close together,
> >that should
> >give you quite some boost.
>
> no warnings in the log (I did change the checkpoint settings when I
> set up the database, but didn't notice an appreciable difference in
> insert performance).

Keep in mind that the default warning time of 30 seconds is pretty
conservative; you'd want to bump that up to 300 seconds or so, probably.

As for the suggestion of multiple insert runs at a time, I suspect that
would just result in a lot of contention for some mutex/semaphore in the
index.

Your best bet really is to run gprof and post those results. It's also
possible that this is fixed be a recent patch to HEAD that reduces the
amount of traffic on the index metapage, something gprof would probably
confirm.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461