Slow ActiveRecord - MySQL

HeistTheAlmighty-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Thu, 09 Nov 2006 21:58:13 -0000

I use find_by_sql to execute a query which takes around 120 seconds to
execute in Ruby. When I execute the same request using SQLyog (GUI),
the requests takes around 15 seconds to execute.

Here''s roughly what the query looks like:

SELECT DAY(date_time) "day", COUNT( * ) "count"
FROM table
WHERE (id = some_id)
AND(YEAR(date_time) = 2006)
AND(MONTH(date_time) = 8)
AND(some_string IN (''some short string'') )
GROUP BY DAY( date_time );

I''m querying about a million records.