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 = 'KENYA') or (n1.n_name = 'KENYA' 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=2366366.58..2368267.48 rows=58489 width=64) (actual time=151410.791..151440.364 rows=4 loops=1) Buffers: shared hit=1095284 read=343332 written=4147 -> Sort (cost=2366366.58..2366512.81 rows=58489 width=64) (actual time=151400.852..151408.773 rows=58546 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: 9770kB Buffers: shared hit=1095284 read=343332 written=4147 -> Hash Join (cost=897897.69..2361735.46 rows=58489 width=64) (actual time=71147.362..151094.355 rows=58546 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1095276 read=343332 written=4147 -> Hash Join (cost=893218.69..2326929.77 rows=1462468 width=72) (actual time=70968.194..146904.758 rows=1456293 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1093094 read=343332 written=4147 -> Bitmap Heap Scan on lineitem (cost=386219.58..1736697.90 rows=18295488 width=20) (actual time=19546.500..69475.065 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=817289 read=304960 written=4144 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381645.71 rows=18295488 width=0) (actual time=18872.043..18872.043 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=5198 read=44617 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=51420.651..51420.651 rows=1198052 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107638kB Buffers: shared hit=275805 read=38372 written=3 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=3417.202..50398.374 rows=1198052 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=275805 read=38372 written=3 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.016..12955.834 rows=15015000 loops=1) Buffers: shared hit=245411 read=10390 written=3 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3417.044..3417.044 rows=119233 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10713kB Buffers: shared hit=30394 read=27982 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=36.591..3300.109 rows=119233 loops=1) Buffers: shared hit=30394 read=27982 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.175..0.403 rows=2 loops=1) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'KENYA'::bpchar)) OR ((n1.n_name = 'KENYA'::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=0.014..0.034 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=0.004..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=42.523..1624.065 rows=59616 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=30391 read=27982 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=29.497..29.497 rows=59616 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=178.874..178.874 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=0.028..136.001 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 151476.736 ms (53 rows) COMMIT; COMMIT