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 = 'ALGERIA' and n2.n_name = 'RUSSIA') or (n1.n_name = 'RUSSIA' and n2.n_name = 'ALGERIA') ) 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=1982681.91..1982689.59 rows=3074 width=64) (actual time=22630.244..22630.244 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=4954240 read=581334 dirtied=123 written=2971 -> HashAggregate (cost=1982457.72..1982503.83 rows=3074 width=64) (actual time=22630.139..22630.151 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=4954232 read=581334 dirtied=123 written=2971 -> Hash Join (cost=62340.37..1981539.54 rows=61212 width=64) (actual time=863.809..22545.562 rows=57543 loops=1) Hash Cond: (lineitem.l_suppkey = supplier.s_suppkey) Join Filter: (((n1.n_name = 'ALGERIA'::bpchar) AND (n2.n_name = 'RUSSIA'::bpchar)) OR ((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'ALGERIA'::bpchar))) Rows Removed by Join Filter: 57770 Buffers: shared hit=4954232 read=581334 dirtied=123 written=2971 -> Nested Loop (cost=58604.97..1969628.88 rows=1470881 width=42) (actual time=804.775..21694.665 rows=1457957 loops=1) Buffers: shared hit=4952049 read=581334 dirtied=123 written=2971 -> Hash Join (cost=58604.40..533422.40 rows=1208396 width=30) (actual time=804.584..12197.454 rows=1201008 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=71396 read=218924 dirtied=123 written=2054 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.010..4190.557 rows=15015000 loops=1) Buffers: shared hit=49256 read=205785 dirtied=123 written=535 -> Hash (cost=57104.40..57104.40 rows=120000 width=30) (actual time=803.960..803.960 rows=119981 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 8289kB Buffers: shared hit=22140 read=13139 written=1519 -> Hash Join (cost=1.40..57104.40 rows=120000 width=30) (actual time=0.058..761.079 rows=119981 loops=1) Hash Cond: (customer.c_nationkey = n2.n_nationkey) Buffers: shared hit=22140 read=13139 written=1519 -> Seq Scan on customer (cost=0.00..50278.00 rows=1500000 width=8) (actual time=0.010..527.185 rows=1500000 loops=1) Buffers: shared hit=22139 read=13139 written=1519 -> Hash (cost=1.38..1.38 rows=2 width=30) (actual time=0.031..0.031 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=0.014..0.021 rows=2 loops=1) Filter: ((n_name = 'RUSSIA'::bpchar) OR (n_name = 'ALGERIA'::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..0.007 rows=1 loops=1201008) Index Cond: ((l_orderkey = orders.o_orderkey) AND (l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4880653 read=362410 written=917 -> Hash (cost=3635.40..3635.40 rows=8000 width=30) (actual time=57.786..57.786 rows=7955 loops=1) Buckets: 8192 Batches: 1 Memory Usage: 546kB Buffers: shared hit=2180 -> Hash Join (cost=1.40..3635.40 rows=8000 width=30) (actual time=0.042..55.551 rows=7955 loops=1) Hash Cond: (supplier.s_nationkey = n1.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.008..39.149 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.38..1.38 rows=2 width=30) (actual time=0.019..0.019 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=0.007..0.013 rows=2 loops=1) Filter: ((n_name = 'ALGERIA'::bpchar) OR (n_name = 'RUSSIA'::bpchar)) Rows Removed by Filter: 23 Buffers: shared hit=1 Planning time: 5.513 ms Execution time: 22678.491 ms (54 rows) COMMIT; COMMIT