On Thu, 19 Mar 2009, Tom Lane wrote:
> Oleg Bartunov <oleg@sai.msu.su> writes:
>> We usually say about 200 unique values as a limit for
>> gist_int_ops.
>
> That seems awfully small ... should we make gist_intbig_ops the default,
> or more likely, raise the signature size of both opclasses? Even at a
> crossover point of 10000 I'm not sure that many real-world apps would
> bother considering gist_int_ops.
gist__int_ops doesn't uses signatures, it uses range compression, which
is not lossy, but not capacious. Perhaps, that's why we decided to use it
as default opclass.
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83