BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select supp_nation, cust_nation, l_year, sum(volume) as revenue from ( select n1.n_name as supp_nation, n2.n_name as cust_nation, extract(year from l_shipdate) as l_year, l_extendedprice * (1 - l_discount) as volume from supplier, lineitem, orders, customer, nation n1, nation n2 where s_suppkey = l_suppkey and o_orderkey = l_orderkey and c_custkey = o_custkey and s_nationkey = n1.n_nationkey and c_nationkey = n2.n_nationkey and ( (n1.n_name = 'BRAZIL' and n2.n_name = 'CANADA') or (n1.n_name = 'CANADA' and n2.n_name = 'BRAZIL') ) and l_shipdate between date '1995-01-01' and date '1996-12-31' ) as shipping group by supp_nation, cust_nation, l_year order by supp_nation, cust_nation, l_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GroupAggregate (cost=2366031.38..2367938.38 rows=58677 width=64) (actual time=95107.911..95134.850 rows=4 loops=1) Buffers: shared hit=799904 read=636086 written=8733 -> Sort (cost=2366031.38..2366178.07 rows=58677 width=64) (actual time=95098.359..95104.204 rows=58381 loops=1) Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone)) Sort Method: quicksort Memory: 9746kB Buffers: shared hit=799904 read=636086 written=8733 -> Hash Join (cost=898492.92..2361384.01 rows=58677 width=64) (actual time=44692.728..94767.705 rows=58381 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=799896 read=636086 written=8733 -> Hash Join (cost=893813.92..2326486.39 rows=1466923 width=72) (actual time=44608.773..91388.397 rows=1452810 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=797714 read=636086 written=8733 -> Bitmap Heap Scan on lineitem (cost=387786.76..1736972.96 rows=18351213 width=20) (actual time=14153.708..36878.862 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=524453 read=595676 written=8729 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383198.96 rows=18351213 width=0) (actual time=13485.335..13485.335 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=57 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=30454.382..30454.382 rows=1197796 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107615kB Buffers: shared hit=273261 read=40410 written=4 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=1139.121..29056.592 rows=1197796 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=273261 read=40410 written=4 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.015..5303.446 rows=15015000 loops=1) Buffers: shared hit=249481 read=5814 written=4 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1139.003..1139.003 rows=119801 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10764kB Buffers: shared hit=23780 read=34596 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.040..1038.321 rows=119801 loops=1) Buffers: shared hit=23780 read=34596 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.093..0.458 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'CANADA'::bpchar)) OR ((n1.n_name = 'CANADA'::bpchar) AND (n2.n_name = 'BRAZIL'::bpchar))) Rows Removed by Join Filter: 623 Buffers: shared hit=3 -> Index Scan using pk_nation on nation n1 (cost=0.00..12.63 rows=25 width=30) (actual time=0.016..0.034 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.195..495.937 rows=59900 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23777 read=34596 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.344..17.344 rows=59900 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=82.301..82.301 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.007..55.865 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 95171.605 ms (53 rows) COMMIT; COMMIT