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 = 'MOROCCO') or (n1.n_name = 'MOROCCO' 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=2365502.68..2367411.66 rows=58738 width=64) (actual time=110363.475..110395.207 rows=4 loops=1) Buffers: shared hit=699577 read=735022 written=10493 -> Sort (cost=2365502.68..2365649.52 rows=58738 width=64) (actual time=110353.210..110361.515 rows=58301 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: 9735kB Buffers: shared hit=699577 read=735022 written=10493 -> Hash Join (cost=898613.87..2360850.04 rows=58738 width=64) (actual time=51426.999..109942.632 rows=58301 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=699569 read=735022 written=10493 -> Hash Join (cost=893934.87..2325920.81 rows=1468458 width=72) (actual time=51289.282..105974.979 rows=1457341 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=697387 read=735022 written=10493 -> Bitmap Heap Scan on lineitem (cost=388395.62..1736807.91 rows=18370419 width=20) (actual time=15543.034..47474.413 rows=18247310 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=435196 read=683874 written=10493 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383803.02 rows=18370419 width=0) (actual time=14842.421..14842.421 rows=18356292 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=35745.547..35745.547 rows=1196684 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107515kB Buffers: shared hit=262191 read=51148 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=1110.896..34845.316 rows=1196684 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=262191 read=51148 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.015..7950.711 rows=15015000 loops=1) Buffers: shared hit=221167 read=33874 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1110.739..1110.739 rows=119675 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10753kB Buffers: shared hit=41024 read=17274 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=43.393..888.066 rows=119675 loops=1) Buffers: shared hit=41024 read=17274 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.072..0.410 rows=2 loops=1) Join Filter: (((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::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=0.010..0.031 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=0.004..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=34.721..421.796 rows=59838 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=41021 read=17274 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.294..23.294 rows=59838 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=135.535..135.535 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=0.015..98.051 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 110423.393 ms (53 rows) COMMIT; COMMIT