On Wed, Dec 3, 2008 at 4:41 PM, Joshua D. Drake <jd@commandprompt.com> wrote:
> If you are concerned about the analyze time between 10, 50 and 150, I
> would suggest that you are concerned about the wrong things. Remember
I can't rule that out. What things do you think I should be concerned
about? ISTM that default_statistics_target trades off ANALYZE time
and query planning time vs. the possibility of better plans. If the
former considerations are not an issue for dst = 50, then maybe we
should emit 50 by default. But the limited evidence that has been
published in this forum thus far doesn't support that contention.
>> > It also seems unlikely that you would hit 256MB of checkpoint segments
>> > on a 100MB database before checkpoint_timeout and if you did, you
>> > certainly did need them.
>>
>> So why do we have this parameter at all?
>
> Excellent question, for a different thread :)
I think the rhetorical answer is "so that we don't fill up the disk",
which gets us back to database size.
...Robert