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 = 'BRAZIL' and n2.n_name = 'MOZAMBIQUE') or (n1.n_name = 'MOZAMBIQUE' and n2.n_name = 'BRAZIL') ) 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=2371885.30..2373799.98 rows=58913 width=64) (actual time=105568.091..105597.676 rows=4 loops=1) Buffers: shared hit=884767 read=553872 written=13711 -> Sort (cost=2371885.30..2372032.59 rows=58913 width=64) (actual time=105557.543..105565.559 rows=58021 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: 9696kB Buffers: shared hit=884767 read=553872 written=13711 -> Hash Join (cost=900633.60..2367217.54 rows=58913 width=64) (actual time=50327.133..105204.048 rows=58021 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=884759 read=553872 written=13711 -> Hash Join (cost=895954.60..2332198.36 rows=1472824 width=72) (actual time=50193.153..101772.361 rows=1460768 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=882577 read=553872 written=13711 -> Bitmap Heap Scan on lineitem (cost=388955.50..1741377.11 rows=18425041 width=20) (actual time=16186.039..45351.119 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=571923 read=550326 written=13676 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384349.24 rows=18425041 width=0) (actual time=15297.971..15297.971 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1818 read=47997 written=30 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=34005.900..34005.900 rows=1200306 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107840kB Buffers: shared hit=310654 read=3546 written=35 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=801.841..32909.656 rows=1200306 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=310654 read=3546 written=35 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.033..6344.200 rows=15015000 loops=1) Buffers: shared hit=252587 read=3214 written=35 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=801.629..801.629 rows=119748 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10759kB Buffers: shared hit=58067 read=332 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=35.024..699.799 rows=119748 loops=1) Buffers: shared hit=58067 read=332 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.140..0.460 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::bpchar)) OR ((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'BRAZIL'::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=0.024..0.052 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=0.008..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=39.548..326.885 rows=59874 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58064 read=332 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=28.207..28.207 rows=59874 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=131.426..131.426 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=0.016..83.438 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 105628.982 ms (53 rows) COMMIT; COMMIT