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 = 'INDONESIA' and n2.n_name = 'UNITED KINGDOM') or (n1.n_name = 'UNITED KINGDOM' and n2.n_name = 'INDONESIA') ) 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=2360306.81..2362211.50 rows=58606 width=64) (actual time=109386.090..109412.949 rows=4 loops=1) Buffers: shared hit=676235 read=755516 written=3187 -> Sort (cost=2360306.81..2360453.32 rows=58606 width=64) (actual time=109376.557..109382.181 rows=57930 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: 9683kB Buffers: shared hit=676235 read=755516 written=3187 -> Hash Join (cost=896729.09..2355665.57 rows=58606 width=64) (actual time=52404.834..108921.899 rows=57930 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=676227 read=755516 written=3187 -> Hash Join (cost=892050.09..2320804.60 rows=1465144 width=72) (actual time=52258.908..105187.138 rows=1460314 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=674045 read=755516 written=3187 -> Bitmap Heap Scan on lineitem (cost=387970.71..1733340.17 rows=18328964 width=20) (actual time=18006.284..45269.621 rows=18229496 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=396030 read=720626 written=3187 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383388.47 rows=18328964 width=0) (actual time=17203.151..17203.151 rows=18319678 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4723 read=45092 written=3092 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=34251.624..34251.624 rows=1205942 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108347kB Buffers: shared hit=278015 read=34890 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=1809.268..32978.320 rows=1205942 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=278015 read=34890 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.019..6386.759 rows=15000000 loops=1) Buffers: shared hit=254005 read=276 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1809.133..1809.133 rows=120617 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10837kB Buffers: shared hit=24010 read=34614 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=39.844..1699.919 rows=120617 loops=1) Buffers: shared hit=24010 read=34614 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.180..0.371 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'UNITED KINGDOM'::bpchar)) OR ((n1.n_name = 'UNITED KINGDOM'::bpchar) AND (n2.n_name = 'INDONESIA'::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..0.041 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.019..0.022 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=37.249..825.057 rows=60308 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=24007 read=34614 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=24.922..24.922 rows=60308 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=145.569..145.569 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=0.012..101.546 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 109457.752 ms (53 rows) COMMIT; COMMIT