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 = 'UNITED STATES' and n2.n_name = 'ARGENTINA') or (n1.n_name = 'ARGENTINA' and n2.n_name = 'UNITED STATES') ) 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=2372775.11..2374681.69 rows=58664 width=64) (actual time=184069.595..184094.817 rows=4 loops=1) Buffers: shared hit=679813 read=762787 written=11962 -> Sort (cost=2372775.11..2372921.77 rows=58664 width=64) (actual time=184060.995..184065.231 rows=58840 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: 9811kB Buffers: shared hit=679813 read=762787 written=11962 -> Hash Join (cost=899916.09..2368128.87 rows=58664 width=64) (actual time=73615.172..183600.805 rows=58840 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=679805 read=762787 written=11962 -> Hash Join (cost=895237.09..2333233.13 rows=1466839 width=72) (actual time=73421.675..179136.372 rows=1464330 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=677623 read=762787 written=11962 -> Bitmap Heap Scan on lineitem (cost=386780.05..1741294.57 rows=18350168 width=20) (actual time=21222.090..101660.182 rows=18246498 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=401768 read=723687 written=11910 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382192.51 rows=18350168 width=0) (actual time=20505.240..20505.240 rows=18466690 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=14 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=52198.488..52198.488 rows=1202033 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107996kB Buffers: shared hit=275855 read=39100 written=52 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=3978.750..51059.742 rows=1202033 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=275855 read=39100 written=52 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.022..13672.111 rows=15015000 loops=1) Buffers: shared hit=252030 read=4530 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3978.565..3978.565 rows=119847 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10768kB Buffers: shared hit=23825 read=34570 written=51 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=50.557..3859.965 rows=119847 loops=1) Buffers: shared hit=23825 read=34570 written=51 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.113..0.474 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'ARGENTINA'::bpchar)) OR ((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'UNITED STATES'::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..0.044 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=0.007..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=42.137..1903.878 rows=59924 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23822 read=34570 written=51 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=33.121..33.121 rows=59924 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=193.317..193.317 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=0.010..141.116 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 184124.655 ms (53 rows) COMMIT; COMMIT