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 = 'UNITED KINGDOM' and n2.n_name = 'MOZAMBIQUE') or (n1.n_name = 'MOZAMBIQUE' and n2.n_name = 'UNITED KINGDOM') ) 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=2363487.14..2365387.94 rows=58486 width=64) (actual time=90071.568..90100.270 rows=4 loops=1) Buffers: shared hit=791088 read=645031 dirtied=254 written=18662 -> Sort (cost=2363487.14..2363633.36 rows=58486 width=64) (actual time=90061.863..90070.443 rows=57715 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: 9653kB Buffers: shared hit=791088 read=645031 dirtied=254 written=18662 -> Hash Join (cost=897232.22..2358856.28 rows=58486 width=64) (actual time=42336.819..89556.649 rows=57715 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=791080 read=645031 dirtied=254 written=18662 -> Hash Join (cost=892553.22..2324057.11 rows=1462144 width=72) (actual time=42198.632..86270.919 rows=1460093 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=788898 read=645031 dirtied=254 written=18662 -> Bitmap Heap Scan on lineitem (cost=386526.06..1734815.61 rows=18291437 width=20) (actual time=15303.535..35382.459 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=524227 read=595902 written=18641 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381953.20 rows=18291437 width=0) (actual time=14615.660..14615.660 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=459 read=49356 written=830 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=26894.427..26894.427 rows=1202152 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108006kB Buffers: shared hit=264671 read=49129 dirtied=254 written=21 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=794.781..26150.530 rows=1202152 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=264671 read=49129 dirtied=254 written=21 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.013..4521.835 rows=15015000 loops=1) Buffers: shared hit=240717 read=14578 dirtied=254 written=13 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=794.672..794.672 rows=120177 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10798kB Buffers: shared hit=23954 read=34551 written=8 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.303..729.906 rows=120177 loops=1) Buffers: shared hit=23954 read=34551 written=8 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.194..0.312 rows=2 loops=1) Join Filter: (((n1.n_name = 'UNITED KINGDOM'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::bpchar)) OR ((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'UNITED KINGDOM'::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=0.010..0.022 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=21.011..348.793 rows=60088 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23951 read=34551 written=8 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.735..13.735 rows=60088 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=137.476..137.476 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=0.010..85.352 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 90133.884 ms (53 rows) COMMIT; COMMIT