Re: Strange..!!! Can u tell me why this ?

On 26 Oct 2002, Pandurang wrote:

> But Later on as the DB size get increased the time was also get
> increased. And at one point i noticed the time required to gererate
> this report is very high near abt 10 to 15 hrs. So I checked for
> performanance.
>
> Site was also become very slow. A simple page which is fetching just
> 20 records, for that also I got the error page not displayed.I tried
> my level best to find out the problem. But I couldn't...!!! :-((
>
> So at last I decided to drop DB and recreate once more after taking
> backup of data. And I did that. After that i was surprised that site
> become very very fast. And the pages for which I got the error comes
> in less than 10 seconds.
>
> So can u tell me why this happens ? Why suddenly DB performanance get
> increased so fastly ? Prev.ly I tried for vacuumdb also....

You tried vacuuming, but were you doing analyze (I believe -z to
vacuumdb)?  What does explain show for the queries in question?