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 = 'SAUDI ARABIA' and n2.n_name = 'ALGERIA') or (n1.n_name = 'ALGERIA' and n2.n_name = 'SAUDI ARABIA') ) 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=1986610.36..1986618.05 rows=3076 width=64) (actual time=22251.834..22251.835 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=5040684 read=468691 dirtied=421 written=835 -> HashAggregate (cost=1986386.02..1986432.16 rows=3076 width=64) (actual time=22251.740..22251.742 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=5040676 read=468691 dirtied=421 written=835 -> Hash Join (cost=62340.37..1985465.78 rows=61349 width=64) (actual time=874.073..22159.117 rows=57572 loops=1) Hash Cond: (lineitem.l_suppkey = supplier.s_suppkey) Join Filter: (((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'ALGERIA'::bpchar)) OR ((n1.n_name = 'ALGERIA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar))) Rows Removed by Join Filter: 57585 Buffers: shared hit=5040676 read=468691 dirtied=421 written=835 -> Nested Loop (cost=58604.97..1973536.88 rows=1474159 width=42) (actual time=820.747..21453.437 rows=1452835 loops=1) Buffers: shared hit=5038493 read=468691 dirtied=421 written=835 -> Hash Join (cost=58604.40..534366.29 rows=1210798 width=30) (actual time=820.582..10420.175 rows=1194838 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=172132 read=118695 dirtied=421 written=255 -> Seq Scan on orders (cost=0.00..406897.75 rows=15134975 width=8) (actual time=0.009..4126.396 rows=15015000 loops=1) Buffers: shared hit=145736 read=109812 dirtied=421 written=206 -> Hash (cost=57104.40..57104.40 rows=120000 width=30) (actual time=819.869..819.869 rows=119719 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 8273kB Buffers: shared hit=26396 read=8883 written=49 -> Hash Join (cost=1.40..57104.40 rows=120000 width=30) (actual time=0.054..775.900 rows=119719 loops=1) Hash Cond: (customer.c_nationkey = n2.n_nationkey) Buffers: shared hit=26396 read=8883 written=49 -> Seq Scan on customer (cost=0.00..50278.00 rows=1500000 width=8) (actual time=0.010..523.765 rows=1500000 loops=1) Buffers: shared hit=26395 read=8883 written=49 -> 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=0.010..0.018 rows=2 loops=1) Filter: ((n_name = 'ALGERIA'::bpchar) OR (n_name = 'SAUDI ARABIA'::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=0.008..0.008 rows=1 loops=1194838) Index Cond: ((l_orderkey = orders.o_orderkey) AND (l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4866361 read=349996 written=580 -> Hash (cost=3635.40..3635.40 rows=8000 width=30) (actual time=52.913..52.913 rows=7944 loops=1) Buckets: 8192 Batches: 1 Memory Usage: 545kB Buffers: shared hit=2180 -> Hash Join (cost=1.40..3635.40 rows=8000 width=30) (actual time=0.046..50.562 rows=7944 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=0.009..33.860 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.38..1.38 rows=2 width=30) (actual time=0.020..0.020 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=0.008..0.015 rows=2 loops=1) Filter: ((n_name = 'SAUDI ARABIA'::bpchar) OR (n_name = 'ALGERIA'::bpchar)) Rows Removed by Filter: 23 Buffers: shared hit=1 Planning time: 6.088 ms Execution time: 22252.331 ms (54 rows) COMMIT; COMMIT