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 = 'VIETNAM' and n2.n_name = 'RUSSIA') or (n1.n_name = 'RUSSIA' and n2.n_name = 'VIETNAM') ) 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=2370284.82..2372195.60 rows=58793 width=64) (actual time=93323.226..93375.563 rows=4 loops=1) Buffers: shared hit=749338 read=689397 written=17302 -> Sort (cost=2370284.82..2370431.81 rows=58793 width=64) (actual time=93304.660..93322.271 rows=58401 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: 9749kB Buffers: shared hit=749338 read=689397 written=17302 -> Hash Join (cost=899837.60..2365627.43 rows=58793 width=64) (actual time=43103.719..92845.317 rows=58401 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=749330 read=689397 written=17302 -> Hash Join (cost=895158.60..2330669.96 rows=1469829 width=72) (actual time=42942.959..89055.649 rows=1459461 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=747148 read=689397 written=17302 -> Bitmap Heap Scan on lineitem (cost=388159.49..1740019.15 rows=18387577 width=20) (actual time=15773.677..40079.464 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=473711 read=648538 written=17013 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383562.60 rows=18387577 width=0) (actual time=15172.503..15172.503 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=27168.714..27168.714 rows=1202446 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108033kB Buffers: shared hit=273437 read=40859 written=289 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=1099.174..26442.464 rows=1202446 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=273437 read=40859 written=289 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.020..4628.033 rows=15015000 loops=1) Buffers: shared hit=249551 read=6250 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1099.046..1099.046 rows=120062 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10787kB Buffers: shared hit=23886 read=34609 written=289 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.480..1003.398 rows=120062 loops=1) Buffers: shared hit=23886 read=34609 written=289 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.353..0.455 rows=2 loops=1) Join Filter: (((n1.n_name = 'VIETNAM'::bpchar) AND (n2.n_name = 'RUSSIA'::bpchar)) OR ((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'VIETNAM'::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=0.037..0.057 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=0.006..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=24.415..478.413 rows=60031 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23883 read=34609 written=289 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.428..16.428 rows=60031 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=160.199..160.199 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=0.013..102.323 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 93412.994 ms (53 rows) COMMIT; COMMIT