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 = 'FRANCE' and n2.n_name = 'GERMANY') or (n1.n_name = 'GERMANY' and n2.n_name = 'FRANCE') ) 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=95631.258..95661.444 rows=4 loops=1) Buffers: shared hit=833999 read=604728 written=6781 -> Sort (cost=2370284.82..2370431.81 rows=58793 width=64) (actual time=95614.454..95624.097 rows=58419 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: 9752kB Buffers: shared hit=833999 read=604728 written=6781 -> Hash Join (cost=899837.60..2365627.43 rows=58793 width=64) (actual time=51402.820..95184.159 rows=58419 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=833991 read=604728 written=6781 -> Hash Join (cost=895158.60..2330669.96 rows=1469829 width=72) (actual time=51266.378..92160.434 rows=1464950 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=831809 read=604728 written=6781 -> Bitmap Heap Scan on lineitem (cost=388159.49..1740019.15 rows=18387577 width=20) (actual time=16831.033..35994.862 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=577440 read=544809 written=6780 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383562.60 rows=18387577 width=0) (actual time=16098.579..16098.579 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6 read=49809 written=194 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=34434.520..34434.520 rows=1206939 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108436kB Buffers: shared hit=254369 read=59919 written=1 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=644.673..33576.340 rows=1206939 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=254369 read=59919 written=1 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.033..5870.936 rows=15015000 loops=1) Buffers: shared hit=196218 read=59583 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=644.512..644.512 rows=120469 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10824kB Buffers: shared hit=58151 read=336 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=36.417..552.358 rows=120469 loops=1) Buffers: shared hit=58151 read=336 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.755..1.105 rows=2 loops=1) Join Filter: (((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'GERMANY'::bpchar)) OR ((n1.n_name = 'GERMANY'::bpchar) AND (n2.n_name = 'FRANCE'::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=0.598..0.626 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.005 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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=33.435..253.758 rows=60234 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58148 read=336 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.694..23.694 rows=60234 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=136.051..136.051 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=0.008..84.876 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 95689.551 ms (53 rows) COMMIT; COMMIT