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 = 'SAUDI ARABIA') or (n1.n_name = 'SAUDI ARABIA' 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=2367736.88..2369641.44 rows=58602 width=64) (actual time=90149.516..90175.414 rows=4 loops=1) Buffers: shared hit=1181748 read=256828 written=555 -> Sort (cost=2367736.88..2367883.38 rows=58602 width=64) (actual time=90139.835..90145.855 rows=58104 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: 9707kB Buffers: shared hit=1181748 read=256828 written=555 -> Hash Join (cost=898575.67..2363095.99 rows=58602 width=64) (actual time=47216.168..89663.998 rows=58104 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1181740 read=256828 written=555 -> Hash Join (cost=893896.67..2328237.12 rows=1465042 width=72) (actual time=47099.642..85966.730 rows=1455129 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1179558 read=256828 written=555 -> Bitmap Heap Scan on lineitem (cost=386897.57..1737858.80 rows=18327682 width=20) (actual time=15453.883..31827.091 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=906220 read=216029 written=537 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382315.65 rows=18327682 width=0) (actual time=14849.425..14849.425 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6135 read=43680 written=31 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=31644.798..31644.798 rows=1197175 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107559kB Buffers: shared hit=273338 read=40799 written=18 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=414.321..30697.152 rows=1197175 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=273338 read=40799 written=18 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.019..5274.527 rows=15015000 loops=1) Buffers: shared hit=215497 read=40304 written=18 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=414.175..414.175 rows=119755 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10760kB Buffers: shared hit=57841 read=495 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.569..367.207 rows=119755 loops=1) Buffers: shared hit=57841 read=495 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.122..0.391 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar)) OR ((n1.n_name = 'SAUDI ARABIA'::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=0.022..0.050 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=0.007..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=18.910..170.818 rows=59878 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57838 read=495 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=12.822..12.822 rows=59878 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=4 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=115.816..115.816 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=0.013..73.774 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 90204.984 ms (53 rows) COMMIT; COMMIT