Re: COPY insert performance

On Jul 26, 2005, at 8:15 AM, Chris Isaacson wrote:
>
> I am using InnoDB with MySQL which appears to enforce true transaction
> support. (http://dev.mysql.com/doc/mysql/en/innodb-overview.html) If
> not, how is InnoDB "cheating"?
>

are you sure your tables are innodb?
chances are high unless you explcitly stated "type = innodb" when
creating that they are myisam.

look at "show table status" output to verify.

>
> I've played with the checkpoint_segments. I noticed an enormous
> improvement increasing from the default to 40, but neglible
> improvement
> thereafter. Do you have a recommendation for a value?

there's been a thread on -hackers recently about checkpoint issues..
in a nut shell there isn't much to do. But I'd say give bizgres a
try if you're going to be continually loading huge amounts of data.

--
Jeff Trout <jeff(at)jefftrout(dot)com>
http://www.jefftrout.com/
http://www.stuarthamm.net/