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 = 'JAPAN' and n2.n_name = 'ARGENTINA') or (n1.n_name = 'ARGENTINA' and n2.n_name = 'JAPAN') ) 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=2373339.05..2375255.21 rows=58959 width=64) (actual time=82337.716..82369.131 rows=4 loops=1) Buffers: shared hit=808551 read=629921 written=3720 -> Sort (cost=2373339.05..2373486.44 rows=58959 width=64) (actual time=82327.369..82336.262 rows=58825 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: 9809kB Buffers: shared hit=808551 read=629921 written=3720 -> Hash Join (cost=901357.22..2368667.30 rows=58959 width=64) (actual time=41963.410..82055.658 rows=58825 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=808543 read=629921 written=3720 -> Hash Join (cost=896678.22..2333592.60 rows=1475566 width=72) (actual time=41884.468..78697.139 rows=1458992 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=806361 read=629921 written=3720 -> Bitmap Heap Scan on lineitem (cost=389679.12..1742615.29 rows=18459345 width=20) (actual time=14998.507..31123.444 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=548525 read=573724 written=238 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..385064.28 rows=18459345 width=0) (actual time=14190.017..14190.017 rows=18413023 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1839 read=47976 written=19 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=26885.081..26885.081 rows=1199849 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107799kB Buffers: shared hit=257836 read=56197 written=3482 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=994.076..25443.130 rows=1199849 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=257836 read=56197 written=3482 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.015..4362.743 rows=15015000 loops=1) Buffers: shared hit=234187 read=21614 written=3482 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=993.907..993.907 rows=119598 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10746kB Buffers: shared hit=23649 read=34583 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.236..733.021 rows=119598 loops=1) Buffers: shared hit=23649 read=34583 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.097..0.428 rows=2 loops=1) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'ARGENTINA'::bpchar)) OR ((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'JAPAN'::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=0.026..0.047 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=0.005..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=19.942..348.963 rows=59799 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23646 read=34583 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.182..13.182 rows=59799 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=78.174..78.174 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=0.017..49.338 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 82407.159 ms (53 rows) COMMIT; COMMIT