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 = 'PERU' and n2.n_name = 'FRANCE') or (n1.n_name = 'FRANCE' and n2.n_name = 'PERU') ) 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=2378741.23..2380662.11 rows=59104 width=64) (actual time=102664.113..102699.120 rows=4 loops=1) Buffers: shared hit=748524 read=694392 written=3244 -> Sort (cost=2378741.23..2378888.99 rows=59104 width=64) (actual time=102653.182..102663.566 rows=57693 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: 9650kB Buffers: shared hit=748524 read=694392 written=3244 -> Hash Join (cost=902705.47..2374056.95 rows=59104 width=64) (actual time=51922.381..102343.586 rows=57693 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=748516 read=694392 written=3244 -> Hash Join (cost=898026.47..2338939.15 rows=1477612 width=72) (actual time=51776.042..98861.495 rows=1453167 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=746334 read=694392 written=3244 -> Bitmap Heap Scan on lineitem (cost=389569.43..1746387.49 rows=18484937 width=20) (actual time=17370.586..41041.596 rows=18227973 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=500432 read=625305 written=3235 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384948.20 rows=18484937 width=0) (actual time=16690.835..16690.835 rows=18481455 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6436 read=43379 written=3166 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=34404.666..34404.666 rows=1198870 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107711kB Buffers: shared hit=245902 read=69087 written=9 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=516.599..32538.734 rows=1198870 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=245902 read=69087 written=9 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.025..7707.718 rows=15000000 loops=1) Buffers: shared hit=187807 read=68753 written=9 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=516.447..516.447 rows=120104 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10791kB Buffers: shared hit=58095 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.376..466.542 rows=120104 loops=1) Buffers: shared hit=58095 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.148..0.413 rows=2 loops=1) Join Filter: (((n1.n_name = 'PERU'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar)) OR ((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'PERU'::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=0.024..0.051 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=0.007..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=20.607..218.718 rows=60052 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58092 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.988..13.988 rows=60052 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=144.707..144.707 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=0.012..96.140 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 102735.590 ms (53 rows) COMMIT; COMMIT