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 = 'ALGERIA' and n2.n_name = 'BRAZIL') or (n1.n_name = 'BRAZIL' and n2.n_name = 'ALGERIA') ) 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=2355764.98..2357656.48 rows=58200 width=64) (actual time=153475.863..153516.505 rows=4 loops=1) Buffers: shared hit=1012791 read=419227 written=115 -> Sort (cost=2355764.98..2355910.48 rows=58200 width=64) (actual time=153465.686..153476.610 rows=57852 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: 9672kB Buffers: shared hit=1012791 read=419227 written=115 -> Hash Join (cost=894539.24..2351158.82 rows=58200 width=64) (actual time=68404.887..153126.764 rows=57852 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1012783 read=419227 written=115 -> Hash Join (cost=889860.24..2316501.68 rows=1455257 width=72) (actual time=68234.911..148861.055 rows=1460202 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1010601 read=419227 written=115 -> Bitmap Heap Scan on lineitem (cost=385294.88..1729113.97 rows=18205273 width=20) (actual time=20415.478..75509.329 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=702587 read=414373 written=115 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380743.56 rows=18205273 width=0) (actual time=19477.325..19477.325 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=107 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=47818.679..47818.679 rows=1200728 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107878kB Buffers: shared hit=308014 read=4854 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=1853.325..46756.096 rows=1200728 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=308014 read=4854 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.016..12133.580 rows=15015000 loops=1) Buffers: shared hit=250499 read=4035 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1853.205..1853.205 rows=119868 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10770kB Buffers: shared hit=57515 read=819 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=35.155..1749.157 rows=119868 loops=1) Buffers: shared hit=57515 read=819 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.061..0.390 rows=2 loops=1) Join Filter: (((n1.n_name = 'ALGERIA'::bpchar) AND (n2.n_name = 'BRAZIL'::bpchar)) OR ((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'ALGERIA'::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=0.016..0.030 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..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=35.112..852.252 rows=59934 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57512 read=819 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.355..23.355 rows=59934 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=168 read=166 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=168.818..168.818 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=0.014..121.569 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 153561.471 ms (53 rows) COMMIT; COMMIT