Richard Lynch wrote:

> On Sat, January 26, 2008 3:45 am, Per Jessen wrote:
>> Nathan Rixham wrote:
>>
>>>Back on the mysql side of things, try using geometry columns rather
>>>than numerical primary keys, with spatial indexes.. it's a MASSIVE
>>>performance upgrade (I've cut 5 second queries down to 0.005 by using
>>>geo columns)
>>
>> Uh, could you could elaborate a bit on that (whilst I go and do some
>> googling)?
> 
> If you are doing geography/geometry stuff, spatial indices can be
> nice.
> 

OK, what is a 'geometry column' and what is a 'spatial index' ? 


/Per Jessen, Zürich

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