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 = 'VIETNAM' and n2.n_name = 'IRAN') or (n1.n_name = 'IRAN' and n2.n_name = 'VIETNAM') ) 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=2379763.07..2381684.95 rows=59135 width=64) (actual time=73474.493..73499.644 rows=4 loops=1) Buffers: shared hit=930161 read=512583 written=3 -> Sort (cost=2379763.07..2379910.90 rows=59135 width=64) (actual time=73465.733..73471.062 rows=58675 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: 9788kB Buffers: shared hit=930161 read=512583 written=3 -> Hash Join (cost=903380.65..2375076.11 rows=59135 width=64) (actual time=36462.623..73188.357 rows=58675 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=930153 read=512583 written=3 -> Hash Join (cost=898701.65..2339910.56 rows=1479976 width=72) (actual time=36386.468..70213.020 rows=1453366 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=927971 read=512583 written=3 -> Bitmap Heap Scan on lineitem (cost=390244.61..1747224.33 rows=18514515 width=20) (actual time=14732.285..28583.960 rows=18227973 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=613206 read=512249 written=3 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..385615.98 rows=18514515 width=0) (actual time=14001.766..14001.766 rows=18466690 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=3 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=21653.272..21653.272 rows=1197384 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107578kB Buffers: shared hit=314765 read=334 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=436.716..20858.971 rows=1197384 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=314765 read=334 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.019..4008.414 rows=15000000 loops=1) Buffers: shared hit=256560 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=436.567..436.567 rows=120098 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10791kB Buffers: shared hit=58205 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=18.926..375.777 rows=120098 loops=1) Buffers: shared hit=58205 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.177..0.345 rows=2 loops=1) Join Filter: (((n1.n_name = 'VIETNAM'::bpchar) AND (n2.n_name = 'IRAN'::bpchar)) OR ((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'VIETNAM'::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=0.027..0.042 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..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=21.640..172.487 rows=60049 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58202 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.625..13.625 rows=60049 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=75.069..75.069 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=0.009..48.871 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 73533.425 ms (53 rows) COMMIT; COMMIT