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 = 'EGYPT') or (n1.n_name = 'EGYPT' 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=2373590.90..2375498.39 rows=58692 width=64) (actual time=177723.319..177754.960 rows=4 loops=1) Buffers: shared hit=721758 read=721456 written=4777 -> Sort (cost=2373590.90..2373737.63 rows=58692 width=64) (actual time=177713.141..177722.048 rows=58129 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: 9711kB Buffers: shared hit=721758 read=721456 written=4777 -> Hash Join (cost=900008.46..2368942.24 rows=58692 width=64) (actual time=72831.345..177372.510 rows=58129 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=721750 read=721456 written=4777 -> Hash Join (cost=895329.46..2334031.68 rows=1467559 width=72) (actual time=72637.435..172915.123 rows=1459548 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=719568 read=721456 written=4777 -> Bitmap Heap Scan on lineitem (cost=386872.42..1742052.12 rows=18359180 width=20) (actual time=21437.967..95011.500 rows=18227973 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=445071 read=680914 written=2225 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382282.63 rows=18359180 width=0) (actual time=20770.710..20770.710 rows=18480448 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4754 read=45061 written=2203 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=51198.531..51198.531 rows=1200128 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107824kB Buffers: shared hit=274497 read=40542 written=2552 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=4257.178..49765.719 rows=1200128 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=274497 read=40542 written=2552 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.023..12282.790 rows=15000000 loops=1) Buffers: shared hit=250632 read=5928 written=270 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=4257.018..4257.018 rows=119921 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10775kB Buffers: shared hit=23865 read=34614 written=2282 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=44.133..4127.792 rows=119921 loops=1) Buffers: shared hit=23865 read=34614 written=2282 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.109..0.371 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'EGYPT'::bpchar)) OR ((n1.n_name = 'EGYPT'::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=0.023..0.046 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.003 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.006..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=42.647..2036.220 rows=59960 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23862 read=34614 written=2282 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=31.106..31.106 rows=59960 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 written=25 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=188.262..188.262 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=0.026..139.601 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 177798.212 ms (53 rows) COMMIT; COMMIT