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 = 'MOZAMBIQUE' and n2.n_name = 'MOROCCO') or (n1.n_name = 'MOROCCO' and n2.n_name = 'MOZAMBIQUE') ) 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=2382539.14..2384460.80 rows=59128 width=64) (actual time=76618.702..76646.922 rows=4 loops=1) Buffers: shared hit=961166 read=484148 written=49 -> Sort (cost=2382539.14..2382686.96 rows=59128 width=64) (actual time=76608.279..76617.793 rows=57681 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: 9648kB Buffers: shared hit=961166 read=484148 written=49 -> Hash Join (cost=903999.16..2377852.78 rows=59128 width=64) (actual time=41422.126..76316.659 rows=57681 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=961158 read=484148 written=49 -> Hash Join (cost=899320.16..2342684.44 rows=1480121 width=72) (actual time=41292.476..73311.741 rows=1456337 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=958976 read=484148 written=49 -> Bitmap Heap Scan on lineitem (cost=389891.15..1749018.01 rows=18516324 width=20) (actual time=14242.862..27443.427 rows=18246713 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=678696 read=448874 written=46 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..385262.07 rows=18516324 width=0) (actual time=13493.893..13493.893 rows=18503145 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2115 read=47700 written=46 -> Hash (cost=494216.31..494216.31 rows=1217016 width=60) (actual time=27048.737..27048.737 rows=1195799 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107436kB Buffers: shared hit=280280 read=35274 written=3 -> Hash Join (cost=15638.06..494216.31 rows=1217016 width=60) (actual time=576.257..25685.252 rows=1195799 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=280280 read=35274 written=3 -> Seq Scan on orders (cost=0.00..409314.79 rows=15224879 width=8) (actual time=0.018..5005.711 rows=15015000 loops=1) Buffers: shared hit=222216 read=34850 written=3 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=576.065..576.065 rows=119630 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10749kB Buffers: shared hit=58064 read=424 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.869..488.215 rows=119630 loops=1) Buffers: shared hit=58064 read=424 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.210..0.405 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::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=0.022..0.042 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=0.005..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=28.210..223.573 rows=59815 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58061 read=424 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.797..18.797 rows=59815 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=331 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=128.664..128.664 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..79.689 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 76678.790 ms (53 rows) COMMIT; COMMIT