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 = 'IRAQ') or (n1.n_name = 'IRAQ' 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=2361786.34..2363689.57 rows=58561 width=64) (actual time=87236.495..87293.108 rows=4 loops=1) Buffers: shared hit=958688 read=474772 dirtied=1065 written=1205 -> Sort (cost=2361786.34..2361932.74 rows=58561 width=64) (actual time=87218.146..87236.212 rows=59488 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: 9902kB Buffers: shared hit=958688 read=474772 dirtied=1065 written=1205 -> Hash Join (cost=897145.78..2357149.00 rows=58561 width=64) (actual time=43745.813..86849.659 rows=59488 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=958680 read=474772 dirtied=1065 written=1205 -> Hash Join (cost=892466.78..2322311.04 rows=1464027 width=72) (actual time=43641.349..83451.914 rows=1461887 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=956498 read=474772 dirtied=1065 written=1205 -> Bitmap Heap Scan on lineitem (cost=387415.44..1733938.23 rows=18314986 width=20) (actual time=14825.508..31859.742 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=655933 read=462082 dirtied=1065 written=1205 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382836.69 rows=18314986 width=0) (actual time=14169.940..14169.940 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=4 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=28814.833..28814.833 rows=1202671 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108053kB Buffers: shared hit=300565 read=12690 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=388.288..26198.081 rows=1202671 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=300565 read=12690 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.016..4712.330 rows=15015000 loops=1) Buffers: shared hit=242431 read=12356 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=388.138..388.138 rows=120157 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10796kB Buffers: shared hit=58134 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.138..347.223 rows=120157 loops=1) Buffers: shared hit=58134 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.177..0.337 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAN'::bpchar) AND (n2.n_name = 'IRAQ'::bpchar)) OR ((n1.n_name = 'IRAQ'::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=0.027..0.054 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=0.005..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=19.268..161.663 rows=60078 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58131 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.101..13.101 rows=60078 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=104.263..104.263 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=0.011..69.967 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 87344.715 ms (53 rows) COMMIT; COMMIT