I was playing a bit with mod_lcr and found that the sql query for fetching the lowest rate can be changed to a better use of indexes, at least on mysql. Anyone can do some test using other DBs?

The change i've made was simple, the original query was something about "... AND digits IN (12345, 1234, 123, 12, 1) ..." and using EXPLAIN i saw that it was using carrier_id as key for the biggest table and not digits. I've changed the code so the query is " AND (digits='12345' OR digits='1234' OR digits='123' OR digits='12' OR digits='1') " and mysql uses the index from the digits row, reducing the returned resultset of the subquery from all the digits from a carrier to the number of "OR" in the query (in my case, from 19850+ to 14).