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 = 'UNITED KINGDOM') or (n1.n_name = 'UNITED KINGDOM' 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=2361253.07..2363155.81 rows=58546 width=64) (actual time=82931.333..82954.978 rows=4 loops=1) Buffers: shared hit=902378 read=529950 written=18799 -> Sort (cost=2361253.07..2361399.43 rows=58546 width=64) (actual time=82922.716..82927.597 rows=58485 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: 9761kB Buffers: shared hit=902378 read=529950 written=18799 -> Hash Join (cost=897267.75..2356617.02 rows=58546 width=64) (actual time=41171.790..82025.963 rows=58485 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=902370 read=529950 written=18799 -> Hash Join (cost=892588.75..2321748.73 rows=1465555 width=72) (actual time=41036.758..78622.754 rows=1463811 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=900188 read=529950 written=18799 -> Bitmap Heap Scan on lineitem (cost=388023.38..1733774.93 rows=18334103 width=20) (actual time=13827.873..30598.580 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=623193 read=493767 written=18750 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383439.86 rows=18334103 width=0) (actual time=12683.337..12683.337 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=27207.964..27207.964 rows=1205677 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108323kB Buffers: shared hit=276995 read=36183 written=49 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=674.391..26492.027 rows=1205677 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=276995 read=36183 written=49 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.023..4313.793 rows=15015000 loops=1) Buffers: shared hit=240681 read=13853 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=674.231..674.231 rows=120387 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10817kB Buffers: shared hit=36314 read=22330 written=49 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.835..600.891 rows=120387 loops=1) Buffers: shared hit=36314 read=22330 written=49 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.270..0.328 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'UNITED KINGDOM'::bpchar)) OR ((n1.n_name = 'UNITED KINGDOM'::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=0.019..0.043 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.000..0.002 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.003..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=20.578..283.704 rows=60194 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=36311 read=22330 written=49 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.505..13.505 rows=60194 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=4 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=133.331..133.331 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=0.015..85.114 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 82982.989 ms (53 rows) COMMIT; COMMIT