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 = 'JORDAN') or (n1.n_name = 'JORDAN' 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 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1972882.11..1972889.81 rows=3079 width=64) (actual time=22301.674..22301.674 rows=4 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: 25kB Buffers: shared hit=4891251 read=642419 dirtied=256 written=25191 -> HashAggregate (cost=1972657.52..1972703.71 rows=3079 width=64) (actual time=22301.592..22301.601 rows=4 loops=1) Group Key: n1.n_name, n2.n_name, date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone) Buffers: shared hit=4891243 read=642419 dirtied=256 written=25191 -> Hash Join (cost=62340.37..1971743.47 rows=60937 width=64) (actual time=832.926..22218.452 rows=58062 loops=1) Hash Cond: (lineitem.l_suppkey = supplier.s_suppkey) Join Filter: (((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'JORDAN'::bpchar)) OR ((n1.n_name = 'JORDAN'::bpchar) AND (n2.n_name = 'JAPAN'::bpchar))) Rows Removed by Join Filter: 57701 Buffers: shared hit=4891243 read=642419 dirtied=256 written=25191 -> Nested Loop (cost=58604.97..1959865.23 rows=1465422 width=42) (actual time=773.500..21445.255 rows=1455810 loops=1) Buffers: shared hit=4891236 read=640243 dirtied=256 written=25191 -> Hash Join (cost=58604.40..531065.43 rows=1202397 width=30) (actual time=773.463..11157.634 rows=1200783 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=118947 read=170107 dirtied=256 written=4755 -> Seq Scan on orders (cost=0.00..404074.68 rows=15029968 width=8) (actual time=0.008..3866.145 rows=15000000 loops=1) Buffers: shared hit=118944 read=134831 dirtied=256 written=4755 -> Hash (cost=57104.40..57104.40 rows=120000 width=30) (actual time=772.819..772.819 rows=119666 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 8270kB Buffers: shared hit=3 read=35276 -> Hash Join (cost=1.40..57104.40 rows=120000 width=30) (actual time=0.043..732.947 rows=119666 loops=1) Hash Cond: (customer.c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=35276 -> Seq Scan on customer (cost=0.00..50278.00 rows=1500000 width=8) (actual time=0.006..517.861 rows=1500000 loops=1) Buffers: shared hit=2 read=35276 -> Hash (cost=1.38..1.38 rows=2 width=30) (actual time=0.023..0.023 rows=2 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.38 rows=2 width=30) (actual time=0.016..0.020 rows=2 loops=1) Filter: ((n_name = 'JORDAN'::bpchar) OR (n_name = 'JAPAN'::bpchar)) Rows Removed by Filter: 23 Buffers: shared hit=1 -> Index Scan using lineitem_l_orderkey_l_linenumber_l_shipdate_idx on lineitem (cost=0.56..1.15 rows=4 width=20) (actual time=0.007..0.008 rows=1 loops=1200783) Index Cond: ((l_orderkey = orders.o_orderkey) AND (l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4772289 read=470136 written=20436 -> Hash (cost=3635.40..3635.40 rows=8000 width=30) (actual time=58.185..58.185 rows=7942 loops=1) Buckets: 8192 Batches: 1 Memory Usage: 545kB Buffers: shared hit=4 read=2176 -> Hash Join (cost=1.40..3635.40 rows=8000 width=30) (actual time=0.038..55.880 rows=7942 loops=1) Hash Cond: (supplier.s_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2176 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.003..41.302 rows=100000 loops=1) Buffers: shared hit=3 read=2176 -> Hash (cost=1.38..1.38 rows=2 width=30) (actual time=0.018..0.018 rows=2 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on nation n1 (cost=0.00..1.38 rows=2 width=30) (actual time=0.009..0.013 rows=2 loops=1) Filter: ((n_name = 'JAPAN'::bpchar) OR (n_name = 'JORDAN'::bpchar)) Rows Removed by Filter: 23 Buffers: shared hit=1 Planning time: 5.215 ms Execution time: 22302.215 ms (54 rows) COMMIT; COMMIT