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 = 'ROMANIA' and n2.n_name = 'JAPAN') or (n1.n_name = 'JAPAN' and n2.n_name = 'ROMANIA') ) 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=2370330.46..2372240.71 rows=58777 width=64) (actual time=117831.832..117861.681 rows=4 loops=1) Buffers: shared hit=1308136 read=130493 written=5305 -> Sort (cost=2370330.46..2370477.40 rows=58777 width=64) (actual time=117822.032..117828.407 rows=58568 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: 9773kB Buffers: shared hit=1308136 read=130493 written=5305 -> Hash Join (cost=899863.80..2365674.45 rows=58777 width=64) (actual time=56481.276..117491.341 rows=58568 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1308128 read=130493 written=5305 -> Hash Join (cost=895184.80..2330715.61 rows=1469909 width=72) (actual time=56322.537..113768.874 rows=1459570 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1305946 read=130493 written=5305 -> Bitmap Heap Scan on lineitem (cost=388185.69..1740060.27 rows=18388572 width=20) (actual time=15016.484..49023.940 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1007627 read=114622 written=5295 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383588.55 rows=18388572 width=0) (actual time=14308.872..14308.872 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=10353 read=39462 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=41305.163..41305.163 rows=1199566 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107774kB Buffers: shared hit=298319 read=15871 written=10 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=1445.133..39828.924 rows=1199566 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=298319 read=15871 written=10 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.019..8784.090 rows=15015000 loops=1) Buffers: shared hit=242339 read=13462 written=10 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1444.957..1444.957 rows=119805 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10764kB Buffers: shared hit=55980 read=2409 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=40.412..1275.499 rows=119805 loops=1) Buffers: shared hit=55980 read=2409 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.200..0.458 rows=2 loops=1) Join Filter: (((n1.n_name = 'ROMANIA'::bpchar) AND (n2.n_name = 'JAPAN'::bpchar)) OR ((n1.n_name = 'JAPAN'::bpchar) AND (n2.n_name = 'ROMANIA'::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=0.024..0.048 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=0.007..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=41.075..615.243 rows=59902 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=55977 read=2409 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.213..30.213 rows=59902 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=158.517..158.517 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=0.010..111.091 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 117891.457 ms (53 rows) COMMIT; COMMIT