Bruce Momjian wrote:
>
> Tom Lane wrote:
> > Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > > Yes, I am seeing only zeros too. Jan?
> >
> > Did you turn on statistics gathering? See the Admin Guide's discussion
> > of database monitoring.
>
> Oops, now I remember. Those are off by default and only the query
> string is on by default. Thanks.
This raises the question, by turning these on, does that affect database
performance?
If so, it may not be the answer for a selective vacuum.
If they do not affect performance, then why have them off?