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=2370522.08..2372429.83 rows=58700 width=64) (actual time=68959.100..68991.193 rows=4 loops=1) Buffers: shared hit=1361002 read=78218 written=5710 -> Sort (cost=2370522.08..2370668.83 rows=58700 width=64) (actual time=68948.087..68957.865 rows=58770 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: 9801kB Buffers: shared hit=1361002 read=78218 written=5710 -> Hash Join (cost=899516.70..2365872.73 rows=58700 width=64) (actual time=38593.257..68671.256 rows=58770 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1360994 read=78218 written=5710 -> Hash Join (cost=894837.70..2330930.51 rows=1469136 width=72) (actual time=38472.289..65812.351 rows=1457559 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1358812 read=78218 written=5710 -> Bitmap Heap Scan on lineitem (cost=387838.60..1740319.16 rows=18378904 width=20) (actual time=14488.996..24495.429 rows=18227889 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1057840 read=65157 written=5545 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383243.87 rows=18378904 width=0) (actual time=13787.221..13787.221 rows=18429500 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=9810 read=40005 written=5545 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=23982.669..23982.669 rows=1198660 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107693kB Buffers: shared hit=300972 read=13061 written=165 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=546.435..22600.664 rows=1198660 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=300972 read=13061 written=165 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.016..3939.651 rows=15000000 loops=1) Buffers: shared hit=243563 read=12238 written=163 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=546.305..546.305 rows=119598 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10746kB Buffers: shared hit=57409 read=823 written=2 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.897..466.472 rows=119598 loops=1) Buffers: shared hit=57409 read=823 written=2 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.090..0.401 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=0.023..0.043 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=0.004..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=24.072..214.277 rows=59799 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57406 read=823 written=2 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.076..16.076 rows=59799 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=119.918..119.918 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..71.691 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 69025.202 ms (53 rows) COMMIT; COMMIT