-----Original Message----- From: pgsql-general-owner@xxxxxxxxxxxxxx [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] On Behalf Of Jeff Amiel Sent: Friday, December 02, 2011 3:20 PM To: pgsql-general@xxxxxxxxxxxxxx Subject: Oddball data distribution giving me planner headaches explain analyze select * from customer_rel where parent_customer in (select customer_id from customer where customer_type='DISTRIBUTOR') " Nested Loop (cost=25429.44..29626.39 rows=931 width=0) (actual time=216.325..1238.091 rows=1025401 loops=1)" " -> HashAggregate (cost=25429.44..25430.80 rows=136 width=4) (actual time=216.304..216.339 rows=68 loops=1)" " -> Seq Scan on customer (cost=0.00..25429.10 rows=136 width=4) (actual time=0.018..216.226 rows=68 loops=1)" " Filter: (customer_type = 'DISTRIBUTOR'::bpchar)" " -> Index Scan using rel_parent on customer_rel (cost=0.00..30.76 rows=7 width=4) (actual time=0.006..8.190 rows=15079 loops=68)" " Index Cond: (parent_customer = customer.customer_id)" "Total runtime: 1514.810 ms" ------------------------------------------------------------ What kind of plan does the following give? EXPLAIN ANALYZE SELECT * FROM customer_rel p JOIN customer c ON (p.parent_customer = c.customer_id) WHERE c.customer_type = 'DISTRIBUTOR' ; David J. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
