8. The method of claim 1 , wherein determining whether the captured query is a candidate comprises running the query against the database to test the selectivity of the filter of the captured query, developing a selectivity estimate for the captured query and comparing the selectivity estimate to selectivity estimates for other queries.
8. The method of claim 1 , wherein determining whether the captured query is a candidate comprises running the query against the database to test the selectivity of the filter of the captured query, developing a selectivity estimate for the captured query and comparing the selectivity estimate to selectivity estimates for other queries. 9. The method of claim 8 , wherein running the query comprises running the query against a portion of the database.