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 KINGDOM' and n2.n_name = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' and n2.n_name = 'UNITED KINGDOM') ) 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=2366031.38..2367938.38 rows=58677 width=64) (actual time=89878.964..89906.336 rows=4 loops=1) Buffers: shared hit=1204114 read=232144 written=6519 -> Sort (cost=2366031.38..2366178.07 rows=58677 width=64) (actual time=89869.241..89876.439 rows=58475 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: 9760kB Buffers: shared hit=1204114 read=232144 written=6519 -> Hash Join (cost=898492.92..2361384.01 rows=58677 width=64) (actual time=43038.846..89371.591 rows=58475 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1204106 read=232144 written=6519 -> Hash Join (cost=893813.92..2326486.39 rows=1466923 width=72) (actual time=42906.777..85877.057 rows=1463687 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1201924 read=232144 written=6519 -> Bitmap Heap Scan on lineitem (cost=387786.76..1736972.96 rows=18351213 width=20) (actual time=13901.160..32472.071 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=889945 read=230184 written=6518 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383198.96 rows=18351213 width=0) (actual time=13273.372..13273.372 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=36880 read=12935 written=12 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=29004.892..29004.892 rows=1205624 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108318kB Buffers: shared hit=311979 read=1960 written=1 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=513.924..27959.061 rows=1205624 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311979 read=1960 written=1 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.019..5061.873 rows=15015000 loops=1) Buffers: shared hit=254657 read=638 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=513.796..513.796 rows=120387 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10817kB Buffers: shared hit=57322 read=1322 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.731..434.416 rows=120387 loops=1) Buffers: shared hit=57322 read=1322 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.271..0.328 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED KINGDOM'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'UNITED KINGDOM'::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..0.046 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=0.006..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=26.264..199.373 rows=60194 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57319 read=1322 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.057..18.057 rows=60194 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=5 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=130.684..130.684 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=0.014..81.408 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 89944.432 ms (53 rows) COMMIT; COMMIT