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 = 'RUSSIA' and n2.n_name = 'UNITED KINGDOM') or (n1.n_name = 'UNITED KINGDOM' and n2.n_name = 'RUSSIA') ) 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=2355409.21..2357306.79 rows=58387 width=64) (actual time=95435.740..95462.633 rows=4 loops=1) Buffers: shared hit=937464 read=492099 written=100 -> Sort (cost=2355409.21..2355555.18 rows=58387 width=64) (actual time=95424.241..95432.123 rows=58768 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: 9801kB Buffers: shared hit=937464 read=492099 written=100 -> Hash Join (cost=895129.10..2350786.90 rows=58387 width=64) (actual time=48224.478..94858.364 rows=58768 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=937456 read=492099 written=100 -> Hash Join (cost=890450.10..2316038.72 rows=1459669 width=72) (actual time=48070.645..91037.831 rows=1459646 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=935279 read=492094 written=100 -> Bitmap Heap Scan on lineitem (cost=386856.71..1729371.85 rows=18260476 width=20) (actual time=17578.172..37901.354 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=623077 read=491761 written=100 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382291.59 rows=18260476 width=0) (actual time=16738.803..16738.803 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6191 read=43624 written=100 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=30491.494..30491.494 rows=1205209 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108281kB Buffers: shared hit=312202 read=333 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=509.353..29272.021 rows=1205209 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=312202 read=333 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.011..5155.921 rows=15015000 loops=1) Buffers: shared hit=254028 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=509.207..509.207 rows=120446 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10822kB Buffers: shared hit=58174 read=333 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.835..438.314 rows=120446 loops=1) Buffers: shared hit=58174 read=333 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.278..0.355 rows=2 loops=1) Join Filter: (((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'UNITED KINGDOM'::bpchar)) OR ((n1.n_name = 'UNITED KINGDOM'::bpchar) AND (n2.n_name = 'RUSSIA'::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=0.020..0.038 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=0.006..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.008..203.091 rows=60223 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58171 read=333 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.452..17.452 rows=60223 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=152.739..152.739 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2174 read=5 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.019..99.878 rows=100000 loops=1) Buffers: shared hit=2174 read=5 Total runtime: 95505.028 ms (53 rows) COMMIT; COMMIT