Re: Row level stats

On Thu, 2003-03-06 at 01:13, Tom Lane wrote:
> Rod Taylor <rbt@rbt.ca> writes:
> > [ optimizing for small frequent queries ]
>
> What if the client doesn't come back with another query for awhile?

Yup.. Thats why I said you basically lose 1 seconds worth of stats (or
rather can't count on when they arrive).

But, that doesn't matter for most cases as you cannot cause a lot of
trouble with 1 seconds worth of activity.  That said, I'd make the
actual value a GUC.

However, having the numbers off by a little (the %age they're off by
decreases with increased activity) is still a lot more useful than not
having any numbers at all.


Anyway, the basic proposal would be to change the on / off flags for row
& block level into a 'stats delay'.  A large number would be off, 0
would have the same properties as today.  Default to be determined (but
1 second seems to be plenty).

--
Rod Taylor <rbt@rbt.ca>

PGP Key: http://www.rbt.ca/rbtpub.asc