"James Shaw" <js102@zepler.net> writes:
> The example given has "Seq Scan on tenk1 (cost=0.00..458.00" in the example,
> but then says, "you will find out that tenk1 has 358 disk pages" and "the
> cost is estimated at 358 page reads". Shouldn't this be 458 disk page
> reads?
No. Why did you stop reading in mid-sentence?
regards, tom lane