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select count(*) status these days

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I'm about to launch an in house 'Aplpha' stage project. One of the marketing driven outputs on the page is filled by a:

SELECT 
  COUNT(*)
WHERE
  date_field IS NOT NULL AND
  date_field > :todays_date;

Last I heard, this kind of query is kind of slow on Postgres in particular, (Love postgres otherwise). Is this still true? 

Is there any architectural way to speed it up? I'd actually like to run it every 2-60 seconds to update a counter on a page for the marketing guy, (which for once, is me :-)
      
Dennis Gearon

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