"Tom Lane" <tgl@sss.pgh.pa.us> wrote
> "Qingqing Zhou" <zhouqq@cs.toronto.edu> writes:
> > By "did this 100 times" do you mean generate a sequence of at most
> > 200000*100 numbers, and for every 200000 numbers, the first half are all
> > zeros and the other half are uniform random numbers?
>
> No, I mean I ran the bit of SQL script I gave 100 separate times.
>
I must misunderstand something here -- I can't figure out that why the cost
of the same procedure keep climbing?
Regards,
Qingqing
