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 = 'IRAN' and n2.n_name = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' and n2.n_name = 'IRAN') ) 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=2356610.47..2358505.61 rows=58312 width=64) (actual time=82372.747..82402.846 rows=4 loops=1) Buffers: shared hit=649423 read=781570 dirtied=82 written=22541 -> Sort (cost=2356610.47..2356756.25 rows=58312 width=64) (actual time=82362.154..82371.727 rows=58141 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: 9713kB Buffers: shared hit=649423 read=781570 dirtied=82 written=22541 -> Hash Join (cost=895349.42..2351994.64 rows=58312 width=64) (actual time=41232.488..82055.079 rows=58141 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=649415 read=781570 dirtied=82 written=22541 -> Hash Join (cost=890670.42..2317252.82 rows=1459407 width=72) (actual time=41143.950..78661.186 rows=1458167 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=649410 read=779393 dirtied=82 written=22541 -> Bitmap Heap Scan on lineitem (cost=386591.04..1730114.90 rows=18257191 width=20) (actual time=15151.706..31596.245 rows=18247629 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=337839 read=778052 dirtied=82 written=22541 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382026.74 rows=18257191 width=0) (actual time=14229.982..14229.982 rows=18302308 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=9 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=25991.092..25991.092 rows=1200379 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107847kB Buffers: shared hit=311571 read=1341 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=430.701..24816.732 rows=1200379 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311571 read=1341 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.018..3971.426 rows=15015000 loops=1) Buffers: shared hit=253276 read=1005 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=430.490..430.490 rows=120107 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10791kB Buffers: shared hit=58295 read=336 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.575..366.187 rows=120107 loops=1) Buffers: shared hit=58295 read=336 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.171..0.342 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'IRAN'::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..0.031 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=0.008..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=20.617..167.710 rows=60054 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58292 read=336 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.486..13.486 rows=60054 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=88.025..88.025 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.007..59.291 rows=100000 loops=1) Buffers: shared hit=2 read=2177 Total runtime: 82446.964 ms (53 rows) COMMIT; COMMIT