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 = 'ARGENTINA' and n2.n_name = 'ROMANIA') or (n1.n_name = 'ROMANIA' and n2.n_name = 'ARGENTINA') ) 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=2378385.82..2380299.81 rows=58892 width=64) (actual time=82666.656..82693.575 rows=4 loops=1) Buffers: shared hit=1019973 read=425076 written=2255 -> Sort (cost=2378385.82..2378533.05 rows=58892 width=64) (actual time=82656.869..82664.677 rows=59156 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: 9855kB Buffers: shared hit=1019973 read=425076 written=2255 -> Hash Join (cost=901937.15..2373719.87 rows=58892 width=64) (actual time=44945.648..82363.328 rows=59156 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1019965 read=425076 written=2255 -> Hash Join (cost=897258.15..2338711.35 rows=1472307 width=72) (actual time=44824.341..79244.291 rows=1462729 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1017783 read=425076 written=2255 -> Bitmap Heap Scan on lineitem (cost=387829.14..1745489.65 rows=18418567 width=20) (actual time=16356.570..31459.008 rows=18246713 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=710809 read=416761 written=2255 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383224.50 rows=18418567 width=0) (actual time=15637.713..15637.713 rows=18503145 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=494216.31..494216.31 rows=1217016 width=60) (actual time=28466.747..28466.747 rows=1199152 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107737kB Buffers: shared hit=306974 read=8315 -> Hash Join (cost=15638.06..494216.31 rows=1217016 width=60) (actual time=595.213..26966.693 rows=1199152 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=306974 read=8315 -> Seq Scan on orders (cost=0.00..409314.79 rows=15224879 width=8) (actual time=0.019..5259.870 rows=15015000 loops=1) Buffers: shared hit=248919 read=8147 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=595.029..595.029 rows=119889 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10772kB Buffers: shared hit=58055 read=168 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=29.991..522.037 rows=119889 loops=1) Buffers: shared hit=58055 read=168 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.097..0.445 rows=2 loops=1) Join Filter: (((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'ROMANIA'::bpchar)) OR ((n1.n_name = 'ROMANIA'::bpchar) AND (n2.n_name = 'ARGENTINA'::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=0.019..0.038 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=29.526..243.457 rows=59944 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58052 read=168 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.285..18.285 rows=59944 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=170 read=166 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=117.039..117.039 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=0.011..70.654 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 82737.454 ms (53 rows) COMMIT; COMMIT