I have a big table that is used in many queries. Most used index is created on date field. Number of records in this table when date field is saturday is about 5 times smaller than other days, on sunday this number is always 0. Statistics target is 1000. Many queries have problems when condition on this table looks like "d between '2007-05-12' and '2007-05-12'" (saturday). EXPLAIN ANALYZE SELECT * FROM i WHERE d BETWEEN '2007-05-12' AND '2007-05-12' Index Scan using i_d on i (cost=0.00..2.39 rows=1 width=402) (actual time=0.053..4.284 rows=1721 loops=1) Index Cond: ((d >= '2007-05-12'::date) AND (d <= '2007-05-12'::date)) Total runtime: 6.645 ms EXPLAIN ANALYZE SELECT * FROM i WHERE d = '2007-05-12' Index Scan using i_d on i (cost=0.00..38.97 rows=1572 width=402) (actual time=0.044..4.250 rows=1721 loops=1) Index Cond: (d = '2007-05-12'::date) Total runtime: 6.619 ms Is there a way to solve this problem?
